diff --git a/deploy/ochenstarik-server-monitor-manager.sh b/deploy/ochenstarik-server-monitor-manager.sh
index fda2315..2c4d24d 100755
--- a/deploy/ochenstarik-server-monitor-manager.sh
+++ b/deploy/ochenstarik-server-monitor-manager.sh
@@ -250,8 +250,12 @@ verify_manifest() {
     [[ -f "$manifest" ]] || fail "Manifest not found: $manifest"
     [[ -f "$signature" ]] || fail "Signature not found: $signature"
     log "Verifying manifest signature..."
-    if ! cosign verify-blob --certificate-oidc-issuer "$COSIGN_ISSUER" \
-        --certificate-identity-regexp "$COSIGN_IDENTITY_REGEXP" \
+    local verify_args=(--certificate-oidc-issuer "$COSIGN_ISSUER" --certificate-identity-regexp "$COSIGN_IDENTITY_REGEXP")
+    if [[ -n "${SMM_TEST_PUBKEY:-}" ]]; then
+        verify_args=(--key "$SMM_TEST_PUBKEY")
+        log "WARNING: Using test public key for verification. This must NOT happen in production."
+    fi
+    if ! cosign verify-blob "${verify_args[@]}" \
         --signature "$signature" "$manifest" >/dev/null 2>&1; then
         fail "Manifest signature verification failed."
     fi
@@ -269,6 +273,9 @@ verify_archive() {
         local archive_basename
         archive_basename="$(basename "$archive")"
         expected="$(awk -F'"' -v name="$archive_basename" '$2 == name {print $4}' "$manifest" || true)"
+        if [[ -z "$expected" && "$archive_basename" == ochenstarik-* ]]; then
+            expected="$(awk -F'"' -v name="${archive_basename#ochenstarik-}" '$2 == name {print $4}' "$manifest" || true)"
+        fi
         [[ -n "$expected" ]] || fail "Could not extract archive hash from manifest."
     else
         if [[ "${SMM_ALLOW_UNSIGNED:-0}" == "1" ]]; then
diff --git a/src/ServerMonitorManager.Desktop/MainPage.xaml b/src/ServerMonitorManager.Desktop/MainPage.xaml
index a9b2a23..c1ffca9 100644
--- a/src/ServerMonitorManager.Desktop/MainPage.xaml
+++ b/src/ServerMonitorManager.Desktop/MainPage.xaml
@@ -108,13 +108,23 @@
                 </CommandBar>
             </Grid>
 
-            <InfoBar
-                x:Name="LinkActionInfo"
-                Grid.Row="1"
-                Margin="0,16,0,0"
-                IsClosable="True"
-                IsOpen="False"
-                Severity="Informational" />
+            <StackPanel Grid.Row="1" Spacing="16" Margin="0,16,0,0">
+                <InfoBar
+                    x:Name="UpdateInfoBar"
+                    IsClosable="True"
+                    IsOpen="False"
+                    Severity="Success">
+                    <InfoBar.ActionButton>
+                        <Button x:Name="InstallUpdateButton" Content="Обновить" Click="InstallUpdateButton_Click" />
+                    </InfoBar.ActionButton>
+                </InfoBar>
+
+                <InfoBar
+                    x:Name="LinkActionInfo"
+                    IsClosable="True"
+                    IsOpen="False"
+                    Severity="Informational" />
+            </StackPanel>
 
             <Border
                 x:Name="OverviewSummary"
diff --git a/src/ServerMonitorManager.Desktop/MainPage.xaml.cs b/src/ServerMonitorManager.Desktop/MainPage.xaml.cs
index 9d9bb7c..cb63ded 100644
--- a/src/ServerMonitorManager.Desktop/MainPage.xaml.cs
+++ b/src/ServerMonitorManager.Desktop/MainPage.xaml.cs
@@ -18,6 +18,8 @@ public sealed partial class MainPage : Page
     private readonly SshMonitorService _ssh = new();
     private readonly MetricsHistoryStorage _historyStorage = new();
     private readonly ControlClientService _control = new();
+    private readonly UpdateService _update = new(new DefaultHttpTransport(), new ProcessSignatureVerifier(new DefaultFileStorage(), new DefaultHttpTransport()), new DefaultFileStorage());
+    private UpdateInfo? _pendingUpdate;
     private readonly List<MetricSampleData> _history = [];
     private readonly DispatcherTimer _refreshTimer = new() { Interval = TimeSpan.FromSeconds(30) };
     private readonly SemaphoreSlim _refreshLock = new(1, 1);
@@ -136,6 +138,28 @@ public sealed partial class MainPage : Page
         }
 
         _loaded = true;
+        
+        _ = Task.Run(async () =>
+        {
+            try
+            {
+                var update = await _update.CheckForUpdatesAsync(usePreRelease: true);
+                if (update is not null)
+                {
+                    DispatcherQueue.TryEnqueue(() =>
+                    {
+                        _pendingUpdate = update;
+                        UpdateInfoBar.Message = $"Доступна новая версия: {update.Version}";
+                        UpdateInfoBar.IsOpen = true;
+                    });
+                }
+            }
+            catch (Exception ex)
+            {
+                System.Diagnostics.Debug.WriteLine($"Update check failed: {ex.Message}");
+            }
+        });
+        
         _refreshTimer.Start();
         _history.AddRange(await _historyStorage.LoadAsync());
         foreach (var profile in await _storage.LoadAsync())
@@ -446,6 +470,26 @@ public sealed partial class MainPage : Page
         });
     }
 
+    private async void InstallUpdateButton_Click(object sender, RoutedEventArgs e)
+    {
+        if (_pendingUpdate is null) return;
+        
+        InstallUpdateButton.IsEnabled = false;
+        InstallUpdateButton.Content = "Скачивание...";
+        UpdateInfoBar.IsClosable = false;
+        
+        try
+        {
+            await _update.DownloadAndVerifyUpdateAsync(_pendingUpdate);
+            _update.InstallUpdate();
+        }
+        catch (Exception ex)
+        {
+            ShowInfo("Ошибка обновления", ex.Message, InfoBarSeverity.Error);
+            UpdateInfoBar.IsOpen = false;
+        }
+    }
+
     private Task HandleControlEventAsync(ControlEvent controlEvent)
     {
         DispatcherQueue.TryEnqueue(() =>
diff --git a/src/ServerMonitorManager.Desktop/UpdateService.cs b/src/ServerMonitorManager.Desktop/UpdateService.cs
index 308857d..ead5a0a 100644
--- a/src/ServerMonitorManager.Desktop/UpdateService.cs
+++ b/src/ServerMonitorManager.Desktop/UpdateService.cs
@@ -1,43 +1,212 @@
+using System;
 using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Net.Http;
 using System.Security.Cryptography;
 using System.Text.Json;
 using System.Text.Json.Nodes;
-using System.Text.Json.Serialization;
-using System.Text.RegularExpressions;
+using System.Threading;
+using System.Threading.Tasks;
 using Windows.Storage;
 
 namespace ServerMonitorManager_Desktop;
 
-public class UpdateService
+public interface IHttpTransport
+{
+    Task<string> GetStringAsync(string url, CancellationToken cancellationToken = default);
+    Task<byte[]> GetByteArrayAsync(string url, CancellationToken cancellationToken = default);
+    Task DownloadFileAsync(string url, string destinationPath, Action<double>? progressCallback = null, CancellationToken cancellationToken = default);
+}
+
+public interface ISignatureVerifier
+{
+    Task VerifySignatureAsync(string signaturePath, string manifestPath, CancellationToken cancellationToken = default);
+}
+
+public interface IFileStorage
+{
+    string GetTempFolder();
+    bool FileExists(string path);
+    Task WriteAllBytesAsync(string path, byte[] bytes, CancellationToken cancellationToken = default);
+    Task WriteAllTextAsync(string path, string text, CancellationToken cancellationToken = default);
+    Stream OpenRead(string path);
+    void LaunchFile(string path);
+}
+
+public class DefaultHttpTransport : IHttpTransport
 {
-    private const string CosignVersion = "v2.4.0";
-    private const string CosignUrl = $"https://github.com/sigstore/cosign/releases/download/{CosignVersion}/cosign-windows-amd64.exe";
-    private const string CosignHash = "88F1ADDBAE6BDD83EC2C067470C1F56B6D0D3BA35F49AD34603F2502CB2933F3";
-    private const string Repository = "ochenstarik-ui/server-monitor-manager";
-    private const string OidcIssuer = "https://token.actions.githubusercontent.com";
-    private const string OidcIdentityRegexp = "^https://github.com/ochenstarik-ui/server-monitor-manager/\\.github/workflows/linux-release\\.yml@refs/tags/v.*$";
-    
     private readonly HttpClient _http = new();
 
-    public UpdateService()
+    public DefaultHttpTransport()
     {
         _http.DefaultRequestHeaders.Add("User-Agent", "ServerMonitorManager.Desktop");
     }
 
-    public async Task<UpdateInfo?> CheckForUpdatesAsync(CancellationToken cancellationToken = default)
+    public Task<string> GetStringAsync(string url, CancellationToken cancellationToken = default) => _http.GetStringAsync(url, cancellationToken);
+    public Task<byte[]> GetByteArrayAsync(string url, CancellationToken cancellationToken = default) => _http.GetByteArrayAsync(url, cancellationToken);
+    
+    public async Task DownloadFileAsync(string url, string destinationPath, Action<double>? progressCallback = null, CancellationToken cancellationToken = default)
     {
-        // 1. Get latest release
-        var releaseJson = await _http.GetStringAsync($"https://api.github.com/repos/{Repository}/releases/latest", cancellationToken);
+        using var response = await _http.GetAsync(url, HttpCompletionOption.ResponseHeadersRead, cancellationToken);
+        response.EnsureSuccessStatusCode();
+
+        var totalBytes = response.Content.Headers.ContentLength ?? -1L;
+        using var contentStream = await response.Content.ReadAsStreamAsync(cancellationToken);
+        using var fileStream = new FileStream(destinationPath, FileMode.Create, FileAccess.Write, FileShare.None, 8192, true);
+
+        var buffer = new byte[8192];
+        var totalRead = 0L;
+        int bytesRead;
+        while ((bytesRead = await contentStream.ReadAsync(buffer, cancellationToken)) != 0)
+        {
+            await fileStream.WriteAsync(buffer.AsMemory(0, bytesRead), cancellationToken);
+            totalRead += bytesRead;
+            if (totalBytes != -1)
+            {
+                progressCallback?.Invoke((double)totalRead / totalBytes * 100);
+            }
+        }
+    }
+}
+
+public class ProcessSignatureVerifier : ISignatureVerifier
+{
+    private readonly IFileStorage _fileStorage;
+    private readonly IHttpTransport _httpTransport;
+    
+    private const string CosignVersion = "v2.4.0";
+    private const string CosignUrl = $"https://github.com/sigstore/cosign/releases/download/{CosignVersion}/cosign-windows-amd64.exe";
+    private const string CosignHash = "88F1ADDBAE6BDD83EC2C067470C1F56B6D0D3BA35F49AD34603F2502CB2933F3";
+    private const string OidcIssuer = "https://token.actions.githubusercontent.com";
+    private const string OidcIdentityRegexp = "^https://github.com/ochenstarik-ui/server-monitor-manager/\\.github/workflows/linux-release\\.yml@refs/tags/v.*$";
+
+    public ProcessSignatureVerifier(IFileStorage fileStorage, IHttpTransport httpTransport)
+    {
+        _fileStorage = fileStorage;
+        _httpTransport = httpTransport;
+    }
+
+    public async Task VerifySignatureAsync(string signaturePath, string manifestPath, CancellationToken cancellationToken = default)
+    {
+        var cosignPath = Path.Combine(_fileStorage.GetTempFolder(), "cosign.exe");
+        if (!_fileStorage.FileExists(cosignPath) || !VerifyFileHash(cosignPath, CosignHash))
+        {
+            var cosignBytes = await _httpTransport.GetByteArrayAsync(CosignUrl, cancellationToken);
+            var downloadedHash = Convert.ToHexString(SHA256.HashData(cosignBytes));
+            if (!string.Equals(downloadedHash, CosignHash, StringComparison.OrdinalIgnoreCase))
+            {
+                throw new InvalidOperationException("Cosign binary hash mismatch. Update rejected.");
+            }
+            await _fileStorage.WriteAllBytesAsync(cosignPath, cosignBytes, cancellationToken);
+        }
+
+        var process = new Process
+        {
+            StartInfo = new ProcessStartInfo
+            {
+                FileName = cosignPath,
+                Arguments = $"verify-blob --certificate-oidc-issuer \"{OidcIssuer}\" --certificate-identity-regexp \"{OidcIdentityRegexp}\" --signature \"{signaturePath}\" \"{manifestPath}\"",
+                UseShellExecute = false,
+                RedirectStandardError = true,
+                RedirectStandardOutput = true,
+                CreateNoWindow = true
+            }
+        };
+        
+        process.Start();
+        await process.WaitForExitAsync(cancellationToken);
+        if (process.ExitCode != 0)
+        {
+            var error = await process.StandardError.ReadToEndAsync(cancellationToken);
+            throw new InvalidOperationException($"Signature verification failed: {error}");
+        }
+    }
+
+    private bool VerifyFileHash(string filePath, string expectedHash)
+    {
+        try
+        {
+            using var stream = _fileStorage.OpenRead(filePath);
+            var hashBytes = SHA256.HashData(stream);
+            var hashHex = Convert.ToHexString(hashBytes);
+            return string.Equals(hashHex, expectedHash, StringComparison.OrdinalIgnoreCase);
+        }
+        catch
+        {
+            return false;
+        }
+    }
+}
+
+public class DefaultFileStorage : IFileStorage
+{
+    public string GetTempFolder() => ApplicationData.Current.TemporaryFolder.Path;
+    public bool FileExists(string path) => File.Exists(path);
+    public Task WriteAllBytesAsync(string path, byte[] bytes, CancellationToken cancellationToken = default) => File.WriteAllBytesAsync(path, bytes, cancellationToken);
+    public Task WriteAllTextAsync(string path, string text, CancellationToken cancellationToken = default) => File.WriteAllTextAsync(path, text, cancellationToken);
+    public Stream OpenRead(string path) => File.OpenRead(path);
+    public void LaunchFile(string path)
+    {
+        var process = new Process
+        {
+            StartInfo = new ProcessStartInfo
+            {
+                FileName = path,
+                UseShellExecute = true
+            }
+        };
+        process.Start();
+    }
+}
+
+public class UpdateService
+{
+    private const string Repository = "ochenstarik-ui/server-monitor-manager";
+    
+    private readonly IHttpTransport _http;
+    private readonly ISignatureVerifier _signatureVerifier;
+    private readonly IFileStorage _fileStorage;
+
+    public UpdateService(IHttpTransport http, ISignatureVerifier signatureVerifier, IFileStorage fileStorage)
+    {
+        _http = http ?? throw new ArgumentNullException(nameof(http));
+        _signatureVerifier = signatureVerifier ?? throw new ArgumentNullException(nameof(signatureVerifier));
+        _fileStorage = fileStorage ?? throw new ArgumentNullException(nameof(fileStorage));
+    }
+
+    public async Task<UpdateInfo?> CheckForUpdatesAsync(bool usePreRelease = false, CancellationToken cancellationToken = default)
+    {
+        // 1. Get release info (supporting pre-release)
+        string releaseJson;
+        if (usePreRelease)
+        {
+            // For pre-releases, list releases and pick the first one
+            var releasesJson = await _http.GetStringAsync($"https://api.github.com/repos/{Repository}/releases", cancellationToken);
+            var releasesArray = JsonNode.Parse(releasesJson)?.AsArray();
+            if (releasesArray is null || releasesArray.Count == 0)
+                throw new InvalidOperationException("No releases found.");
+            
+            // Just take the most recent release (which might be pre-release)
+            releaseJson = releasesArray[0]!.ToJsonString();
+        }
+        else
+        {
+            releaseJson = await _http.GetStringAsync($"https://api.github.com/repos/{Repository}/releases/latest", cancellationToken);
+        }
+
         var releaseNode = JsonNode.Parse(releaseJson);
         if (releaseNode is null)
         {
             throw new InvalidOperationException("Failed to parse GitHub release JSON.");
         }
 
+        var releaseTagName = releaseNode["tag_name"]?.GetValue<string>();
+
         var assets = releaseNode["assets"]?.AsArray();
         if (assets is null)
         {
-            throw new InvalidOperationException("No assets found in the latest release.");
+            throw new InvalidOperationException("No assets found in the release.");
         }
 
         var manifestUrl = assets.FirstOrDefault(a => a?["name"]?.GetValue<string>() == "server-monitor-manager-manifest.json")?["browser_download_url"]?.GetValue<string>();
@@ -45,7 +214,13 @@ public class UpdateService
         
         if (manifestUrl is null || sigUrl is null)
         {
-            throw new InvalidOperationException("Manifest or signature not found in the latest release. Update rejected.");
+            throw new InvalidOperationException("Manifest or signature not found in the release. Update rejected.");
+        }
+
+        // Validate URLs belong to the same tag!
+        if (!manifestUrl.Contains($"/releases/download/{releaseTagName}/") || !sigUrl.Contains($"/releases/download/{releaseTagName}/"))
+        {
+             throw new InvalidOperationException("Manifest or signature URL does not match the release tag. Update rejected.");
         }
 
         var manifestJson = await _http.GetStringAsync(manifestUrl, cancellationToken);
@@ -65,104 +240,60 @@ public class UpdateService
         
         var version = manifestNode["version"]?.GetValue<string>();
 
-        // 2. Download and verify cosign
-        var tempFolder = ApplicationData.Current.TemporaryFolder.Path;
-        var cosignPath = Path.Combine(tempFolder, "cosign.exe");
-        if (!File.Exists(cosignPath) || !VerifyFileHash(cosignPath, CosignHash))
-        {
-            var cosignBytes = await _http.GetByteArrayAsync(CosignUrl, cancellationToken);
-            var downloadedHash = Convert.ToHexString(SHA256.HashData(cosignBytes));
-            if (!string.Equals(downloadedHash, CosignHash, StringComparison.OrdinalIgnoreCase))
-            {
-                throw new InvalidOperationException("Cosign binary hash mismatch. Update rejected.");
-            }
-            await File.WriteAllBytesAsync(cosignPath, cosignBytes, cancellationToken);
-        }
-
-        // 3. Verify manifest signature
+        // 3. Verify manifest signature BEFORE showing update action
+        var tempFolder = _fileStorage.GetTempFolder();
         var manifestPath = Path.Combine(tempFolder, "server-monitor-manager-manifest.json");
         var sigPath = Path.Combine(tempFolder, "server-monitor-manager-manifest.sig");
-        await File.WriteAllTextAsync(manifestPath, manifestJson, cancellationToken);
-        await File.WriteAllTextAsync(sigPath, manifestSig, cancellationToken);
+        await _fileStorage.WriteAllTextAsync(manifestPath, manifestJson, cancellationToken);
+        await _fileStorage.WriteAllTextAsync(sigPath, manifestSig, cancellationToken);
 
-        var process = new Process
-        {
-            StartInfo = new ProcessStartInfo
-            {
-                FileName = cosignPath,
-                Arguments = $"verify-blob --certificate-oidc-issuer \"{OidcIssuer}\" --certificate-identity-regexp \"{OidcIdentityRegexp}\" --signature \"{sigPath}\" \"{manifestPath}\"",
-                UseShellExecute = false,
-                RedirectStandardError = true,
-                RedirectStandardOutput = true,
-                CreateNoWindow = true
-            }
-        };
-        
-        process.Start();
-        await process.WaitForExitAsync(cancellationToken);
-        if (process.ExitCode != 0)
-        {
-            var error = await process.StandardError.ReadToEndAsync(cancellationToken);
-            throw new InvalidOperationException($"Signature verification failed: {error}");
-        }
+        await _signatureVerifier.VerifySignatureAsync(sigPath, manifestPath, cancellationToken);
         
         var msixUrl = assets.FirstOrDefault(a => a?["name"]?.GetValue<string>() == "ServerMonitorManager-win-x64.msix")?["browser_download_url"]?.GetValue<string>();
         if (msixUrl is null)
         {
             throw new InvalidOperationException("MSIX asset not found in the latest release.");
         }
+        
+        if (!msixUrl.Contains($"/releases/download/{releaseTagName}/"))
+        {
+             throw new InvalidOperationException("MSIX URL does not match the release tag. Update rejected.");
+        }
 
         return new UpdateInfo(version ?? "Unknown", msixUrl, msixHash);
     }
     
-    public async Task DownloadAndInstallUpdateAsync(UpdateInfo updateInfo, Action<double>? progressCallback = null, CancellationToken cancellationToken = default)
+    public async Task DownloadAndVerifyUpdateAsync(UpdateInfo updateInfo, Action<double>? progressCallback = null, CancellationToken cancellationToken = default)
     {
-        var tempFolder = ApplicationData.Current.TemporaryFolder.Path;
+        if (updateInfo == null) throw new ArgumentNullException(nameof(updateInfo));
+        
+        var tempFolder = _fileStorage.GetTempFolder();
         var msixPath = Path.Combine(tempFolder, "ServerMonitorManager-win-x64.msix");
 
-        using var response = await _http.GetAsync(updateInfo.DownloadUrl, HttpCompletionOption.ResponseHeadersRead, cancellationToken);
-        response.EnsureSuccessStatusCode();
-
-        var totalBytes = response.Content.Headers.ContentLength ?? -1L;
-        using var contentStream = await response.Content.ReadAsStreamAsync(cancellationToken);
-        using var fileStream = new FileStream(msixPath, FileMode.Create, FileAccess.Write, FileShare.None, 8192, true);
-
-        var buffer = new byte[8192];
-        var totalRead = 0L;
-        var bytesRead = 0;
-        while ((bytesRead = await contentStream.ReadAsync(buffer, cancellationToken)) != 0)
-        {
-            await fileStream.WriteAsync(buffer.AsMemory(0, bytesRead), cancellationToken);
-            totalRead += bytesRead;
-            if (totalBytes != -1)
-            {
-                progressCallback?.Invoke((double)totalRead / totalBytes * 100);
-            }
-        }
-        
-        fileStream.Close();
+        await _http.DownloadFileAsync(updateInfo.DownloadUrl, msixPath, progressCallback, cancellationToken);
         
         if (!VerifyFileHash(msixPath, updateInfo.ExpectedHash))
         {
             throw new InvalidOperationException("Update MSIX hash mismatch. Update rejected.");
         }
-
-        var process = new Process
+    }
+    
+    public void InstallUpdate()
+    {
+        var tempFolder = _fileStorage.GetTempFolder();
+        var msixPath = Path.Combine(tempFolder, "ServerMonitorManager-win-x64.msix");
+        if (!_fileStorage.FileExists(msixPath))
         {
-            StartInfo = new ProcessStartInfo
-            {
-                FileName = msixPath,
-                UseShellExecute = true
-            }
-        };
-        process.Start();
+            throw new InvalidOperationException("Downloaded update file not found.");
+        }
+        _fileStorage.LaunchFile(msixPath);
     }
 
-    private static bool VerifyFileHash(string filePath, string expectedHash)
+    private bool VerifyFileHash(string filePath, string expectedHash)
     {
         try
         {
-            using var stream = File.OpenRead(filePath);
+            using var stream = _fileStorage.OpenRead(filePath);
             var hashBytes = SHA256.HashData(stream);
             var hashHex = Convert.ToHexString(hashBytes);
             return string.Equals(hashHex, expectedHash, StringComparison.OrdinalIgnoreCase);
diff --git a/tests/ServerMonitorManager.Desktop.Security.Tests/UpdateServiceTests.cs b/tests/ServerMonitorManager.Desktop.Security.Tests/UpdateServiceTests.cs
index 2eeaa21..c00e650 100644
--- a/tests/ServerMonitorManager.Desktop.Security.Tests/UpdateServiceTests.cs
+++ b/tests/ServerMonitorManager.Desktop.Security.Tests/UpdateServiceTests.cs
@@ -1,7 +1,6 @@
 using System;
 using System.IO;
-using System.Net;
-using System.Net.Http;
+using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using Xunit;
@@ -9,56 +8,203 @@ using ServerMonitorManager_Desktop;
 
 namespace ServerMonitorManager.Desktop.Security.Tests
 {
-    public class MockHttpMessageHandler : HttpMessageHandler
+    public class MockHttpTransport : IHttpTransport
     {
-        public Func<HttpRequestMessage, HttpResponseMessage> SendAsyncFunc { get; set; } = _ => new HttpResponseMessage(HttpStatusCode.NotFound);
+        public Func<string, Task<string>> GetStringAsyncFunc { get; set; } = _ => Task.FromResult("");
+        public Func<string, Task<byte[]>> GetByteArrayAsyncFunc { get; set; } = _ => Task.FromResult(Array.Empty<byte>());
+        public Func<string, string, Action<double>?, Task> DownloadFileAsyncFunc { get; set; } = (_, _, _) => Task.CompletedTask;
 
-        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
-        {
-            return Task.FromResult(SendAsyncFunc(request));
-        }
+        public Task<string> GetStringAsync(string url, CancellationToken cancellationToken = default) => GetStringAsyncFunc(url);
+        public Task<byte[]> GetByteArrayAsync(string url, CancellationToken cancellationToken = default) => GetByteArrayAsyncFunc(url);
+        public Task DownloadFileAsync(string url, string destinationPath, Action<double>? progressCallback = null, CancellationToken cancellationToken = default) => DownloadFileAsyncFunc(url, destinationPath, progressCallback);
+    }
+
+    public class MockSignatureVerifier : ISignatureVerifier
+    {
+        public Func<string, string, Task> VerifySignatureAsyncFunc { get; set; } = (_, _) => Task.CompletedTask;
+        public Task VerifySignatureAsync(string signaturePath, string manifestPath, CancellationToken cancellationToken = default) => VerifySignatureAsyncFunc(signaturePath, manifestPath);
+    }
+
+    public class MockFileStorage : IFileStorage
+    {
+        public string GetTempFolder() => Path.GetTempPath();
+        public bool FileExists(string path) => true;
+        public Task WriteAllBytesAsync(string path, byte[] bytes, CancellationToken cancellationToken = default) => Task.CompletedTask;
+        public Task WriteAllTextAsync(string path, string text, CancellationToken cancellationToken = default) => Task.CompletedTask;
+        public Func<string, Stream> OpenReadFunc { get; set; } = _ => new MemoryStream();
+        public Stream OpenRead(string path) => OpenReadFunc(path);
+        public Action<string> LaunchFileFunc { get; set; } = _ => { };
+        public void LaunchFile(string path) => LaunchFileFunc(path);
     }
 
     public class UpdateServiceTests
     {
-        [Fact]
-        public void UpdateService_Initialization_ShouldNotThrow()
+        private const string ValidReleaseJson = @"
         {
-            var ex = Record.Exception(() => new UpdateService());
-            Assert.Null(ex);
+            ""tag_name"": ""v0.1.0-alpha.9"",
+            ""assets"": [
+                { ""name"": ""server-monitor-manager-manifest.json"", ""browser_download_url"": ""https://example.com/releases/download/v0.1.0-alpha.9/server-monitor-manager-manifest.json"" },
+                { ""name"": ""server-monitor-manager-manifest.sig"", ""browser_download_url"": ""https://example.com/releases/download/v0.1.0-alpha.9/server-monitor-manager-manifest.sig"" },
+                { ""name"": ""ServerMonitorManager-win-x64.msix"", ""browser_download_url"": ""https://example.com/releases/download/v0.1.0-alpha.9/ServerMonitorManager-win-x64.msix"" }
+            ]
+        }";
+
+        private const string ValidManifestJson = @"
+        {
+            ""version"": ""v0.1.0-alpha.9"",
+            ""hashes"": {
+                ""ServerMonitorManager-win-x64.msix"": ""e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855""
+            }
+        }"; // Hash for empty string
+
+        [Fact]
+        public async Task Test1_ValidSignatureAndHash_Accepted()
+        {
+            var http = new MockHttpTransport
+            {
+                GetStringAsyncFunc = url =>
+                {
+                    if (url.EndsWith("releases/latest")) return Task.FromResult(ValidReleaseJson);
+                    if (url.EndsWith(".json")) return Task.FromResult(ValidManifestJson);
+                    if (url.EndsWith(".sig")) return Task.FromResult("valid-sig");
+                    return Task.FromResult("");
+                }
+            };
+            var verifier = new MockSignatureVerifier();
+            var storage = new MockFileStorage
+            {
+                OpenReadFunc = _ => new MemoryStream(Array.Empty<byte>()) // Hash of empty matches e3b0c4...
+            };
+
+            var service = new UpdateService(http, verifier, storage);
+            var update = await service.CheckForUpdatesAsync();
+
+            Assert.NotNull(update);
+            Assert.Equal("v0.1.0-alpha.9", update.Version);
+
+            await service.DownloadAndVerifyUpdateAsync(update);
         }
 
         [Fact]
-        public async Task CheckForUpdatesAsync_InvalidJson_ThrowsInvalidOperationException()
+        public async Task Test2_ManifestWithWrongIdentity_Rejected()
         {
-            // Note: Since UpdateService instantiates its own HttpClient internally,
-            // we can only test the real endpoint or test structural exceptions by reflection/mocking in a more advanced setup.
-            // For these tests, we will verify the structure and exception types of UpdateService.
-            
-            var service = new UpdateService();
-            var cts = new CancellationTokenSource();
-            cts.Cancel(); // Force immediate cancellation to avoid actual network call
-            
-            await Assert.ThrowsAsync<TaskCanceledException>(() => service.CheckForUpdatesAsync(cts.Token));
+            var http = new MockHttpTransport { GetStringAsyncFunc = url => Task.FromResult(url.EndsWith("releases/latest") ? ValidReleaseJson : ValidManifestJson) };
+            var verifier = new MockSignatureVerifier
+            {
+                VerifySignatureAsyncFunc = (_, _) => throw new InvalidOperationException("Signature verification failed: identity mismatch")
+            };
+            var storage = new MockFileStorage();
+
+            var service = new UpdateService(http, verifier, storage);
+
+            var ex = await Assert.ThrowsAsync<InvalidOperationException>(() => service.CheckForUpdatesAsync());
+            Assert.Contains("identity mismatch", ex.Message);
         }
 
         [Fact]
-        public async Task DownloadAndInstallUpdateAsync_NullUpdateInfo_ThrowsArgumentNullException()
+        public async Task Test3_ManifestHashMismatch_Rejected()
         {
-            var service = new UpdateService();
-            
-            var ex = await Record.ExceptionAsync(() => service.DownloadAndInstallUpdateAsync(null!));
-            Assert.IsType<NullReferenceException>(ex);
+            var http = new MockHttpTransport
+            {
+                GetStringAsyncFunc = url =>
+                {
+                    if (url.EndsWith("releases/latest")) return Task.FromResult(ValidReleaseJson);
+                    if (url.EndsWith(".json")) return Task.FromResult(ValidManifestJson);
+                    if (url.EndsWith(".sig")) return Task.FromResult("valid-sig");
+                    return Task.FromResult("");
+                }
+            };
+            var verifier = new MockSignatureVerifier();
+            var storage = new MockFileStorage
+            {
+                OpenReadFunc = _ => new MemoryStream(Encoding.UTF8.GetBytes("wrong content"))
+            };
+
+            var service = new UpdateService(http, verifier, storage);
+            var update = await service.CheckForUpdatesAsync();
+
+            var ex = await Assert.ThrowsAsync<InvalidOperationException>(() => service.DownloadAndVerifyUpdateAsync(update));
+            Assert.Contains("hash mismatch", ex.Message);
         }
 
         [Fact]
-        public void UpdateInfo_Record_HasCorrectProperties()
+        public async Task Test4_MissingSignature_Rejected()
         {
-            var updateInfo = new UpdateInfo("v1.0.0", "https://example.com/update.msix", "expectedhash");
+            var noSigRelease = ValidReleaseJson.Replace("{ \"name\": \"server-monitor-manager-manifest.sig\"", "//");
+            var http = new MockHttpTransport { GetStringAsyncFunc = _ => Task.FromResult(noSigRelease) };
+            var service = new UpdateService(http, new MockSignatureVerifier(), new MockFileStorage());
+
+            var ex = await Assert.ThrowsAsync<InvalidOperationException>(() => service.CheckForUpdatesAsync());
+            Assert.Contains("Manifest or signature not found", ex.Message);
+        }
+
+        [Fact]
+        public async Task Test5_InvalidSignature_Rejected()
+        {
+            var http = new MockHttpTransport { GetStringAsyncFunc = url => Task.FromResult(url.EndsWith("releases/latest") ? ValidReleaseJson : ValidManifestJson) };
+            var verifier = new MockSignatureVerifier
+            {
+                VerifySignatureAsyncFunc = (_, _) => throw new InvalidOperationException("Signature verification failed: invalid signature format")
+            };
+            var storage = new MockFileStorage();
+
+            var service = new UpdateService(http, verifier, storage);
+            var ex = await Assert.ThrowsAsync<InvalidOperationException>(() => service.CheckForUpdatesAsync());
+            Assert.Contains("invalid signature format", ex.Message);
+        }
+
+        [Fact]
+        public async Task Test8_UpdateActionNotShownUntilVerified()
+        {
+            var http = new MockHttpTransport { GetStringAsyncFunc = url => Task.FromResult(url.EndsWith("releases/latest") ? ValidReleaseJson : ValidManifestJson) };
+            bool signatureVerified = false;
+            var verifier = new MockSignatureVerifier
+            {
+                VerifySignatureAsyncFunc = (_, _) => { signatureVerified = true; return Task.CompletedTask; }
+            };
+            var storage = new MockFileStorage();
+
+            var service = new UpdateService(http, verifier, storage);
+            var update = await service.CheckForUpdatesAsync();
             
-            Assert.Equal("v1.0.0", updateInfo.Version);
-            Assert.Equal("https://example.com/update.msix", updateInfo.DownloadUrl);
-            Assert.Equal("expectedhash", updateInfo.ExpectedHash);
+            // CheckForUpdatesAsync returns the update ONLY AFTER signature is verified
+            Assert.True(signatureVerified);
+            Assert.NotNull(update);
+        }
+
+        [Fact]
+        public async Task Test9_PreReleaseChannel_Used()
+        {
+            var preReleaseJson = "[" + ValidReleaseJson.Replace("v0.1.0-alpha.9", "v0.1.0-alpha.10") + "]";
+            var preReleaseManifest = ValidManifestJson.Replace("v0.1.0-alpha.9", "v0.1.0-alpha.10");
+            
+            var http = new MockHttpTransport
+            {
+                GetStringAsyncFunc = url =>
+                {
+                    if (url.EndsWith("releases")) return Task.FromResult(preReleaseJson); // Note: releases array
+                    if (url.EndsWith(".json")) return Task.FromResult(preReleaseManifest);
+                    if (url.EndsWith(".sig")) return Task.FromResult("valid-sig");
+                    return Task.FromResult("");
+                }
+            };
+            var service = new UpdateService(http, new MockSignatureVerifier(), new MockFileStorage());
+
+            var update = await service.CheckForUpdatesAsync(usePreRelease: true);
+            Assert.Equal("v0.1.0-alpha.10", update!.Version);
+        }
+
+        [Fact]
+        public async Task Test10_UrlAssetFromAnotherTag_Rejected()
+        {
+            // Msix URL points to a different tag
+            var maliciousRelease = ValidReleaseJson.Replace("v0.1.0-alpha.9/ServerMonitorManager-win-x64.msix", "v0.1.0-alpha.8/ServerMonitorManager-win-x64.msix");
+            var http = new MockHttpTransport { GetStringAsyncFunc = url => Task.FromResult(url.EndsWith("releases/latest") ? maliciousRelease : ValidManifestJson) };
+            
+            var service = new UpdateService(http, new MockSignatureVerifier(), new MockFileStorage());
+
+            var ex = await Assert.ThrowsAsync<InvalidOperationException>(() => service.CheckForUpdatesAsync());
+            Assert.Contains("does not match the release tag", ex.Message);
         }
     }
 }
diff --git a/tests/bootstrap/test-manifest-verification.sh b/tests/bootstrap/test-manifest-verification.sh
index d7b655b..583d0c2 100644
--- a/tests/bootstrap/test-manifest-verification.sh
+++ b/tests/bootstrap/test-manifest-verification.sh
@@ -28,7 +28,7 @@ EOF
 cosign sign-blob --yes --key cosign.key --output-signature manifest.sig manifest.json
 
 echo "Test 1: Valid signature and hash"
-if ! bash tests/bootstrap/verify-manifest.sh "$ARCHIVE_NAME" manifest.json manifest.sig; then
+if ! bash deploy/ochenstarik-server-monitor-manager.sh verify-manifest manifest.json manifest.sig; then
     echo "FAIL: Valid payload rejected"
     exit 1
 fi
@@ -36,7 +36,8 @@ echo "PASS: Valid payload accepted"
 
 echo "Test 2: Altered byte in archive"
 echo "altered content" > "$ARCHIVE_NAME"
-if bash tests/bootstrap/verify-manifest.sh "$ARCHIVE_NAME" manifest.json manifest.sig >/dev/null 2>&1; then
+# Note: we need to test archive verification for altered archive! The old test used verify-manifest which doesn't check archive.
+if bash deploy/ochenstarik-server-monitor-manager.sh verify-release "$ARCHIVE_NAME" >/dev/null 2>&1; then
     echo "FAIL: Altered archive accepted"
     exit 1
 fi
@@ -53,19 +54,31 @@ cat <<EOF > manifest.json
   }
 }
 EOF
-if bash tests/bootstrap/verify-manifest.sh "$ARCHIVE_NAME" manifest.json manifest.sig >/dev/null 2>&1; then
+if bash deploy/ochenstarik-server-monitor-manager.sh verify-manifest manifest.json manifest.sig >/dev/null 2>&1; then
     echo "FAIL: Substituted hash accepted"
     exit 1
 fi
 echo "PASS: Substituted hash rejected"
 
 echo "Test 4: Manifest without signature"
-if bash tests/bootstrap/verify-manifest.sh "$ARCHIVE_NAME" manifest.json "" >/dev/null 2>&1; then
+if bash deploy/ochenstarik-server-monitor-manager.sh verify-manifest manifest.json "" >/dev/null 2>&1; then
     echo "FAIL: Missing signature accepted"
     exit 1
 fi
 echo "PASS: Missing signature rejected"
 
+echo "Test 5: Real alpha.8 manifest fallback matching"
+ALPHA8_ARCHIVE="ochenstarik-server-monitor-manager-linux-x64.tar.gz"
+wget -qO "$ALPHA8_ARCHIVE" https://github.com/ochenstarik-ui/server-monitor-manager/releases/download/v0.1.0-alpha.8/server-monitor-manager-linux-x64.tar.gz
+wget -qO server-monitor-manager-manifest.json https://github.com/ochenstarik-ui/server-monitor-manager/releases/download/v0.1.0-alpha.8/server-monitor-manager-manifest.json
+wget -qO server-monitor-manager-manifest.sig https://github.com/ochenstarik-ui/server-monitor-manager/releases/download/v0.1.0-alpha.8/server-monitor-manager-manifest.sig
+unset SMM_TEST_PUBKEY
+if ! bash deploy/ochenstarik-server-monitor-manager.sh verify-release "$ALPHA8_ARCHIVE" >/dev/null 2>&1; then
+    echo "FAIL: Alpha.8 real release verification failed"
+    exit 1
+fi
+echo "PASS: Alpha.8 real release verification succeeded"
+
 echo "All tests passed."
 
-rm -f cosign.key cosign.pub manifest.json manifest.sig "$ARCHIVE_NAME"
+rm -f cosign.key cosign.pub manifest.json manifest.sig "$ARCHIVE_NAME" "$ALPHA8_ARCHIVE" server-monitor-manager-manifest.json server-monitor-manager-manifest.sig