Добавьте файлы проекта.

Updater/Core/UpdaterApp.cs

@@ -0,0 +1,67 @@
+namespace Updater.Core;
+
+/// <summary>
+/// Управляет потоком обновлений: извлечение, установка, перезапуск.
+/// </summary>
+public sealed class UpdaterApp
+{
+    private readonly ILogger _log;
+    private readonly IExtractor _extractor;
+    private readonly IInstaller _installer;
+    private readonly IProcessManager _proc;
+
+    public UpdaterApp(ILogger log, IExtractor extractor, IInstaller installer, IProcessManager proc)
+    {
+        _log = log;
+        _extractor = extractor;
+        _installer = installer;
+        _proc = proc;
+    }
+
+    /// <summary>Запускает рабочий процесс обновления.</summary>
+    public int Run(Options opts)
+    {
+        var tempExtractDir = Path.Combine(Path.GetTempPath(), $"upd_extract_{Guid.NewGuid():N}");
+        Directory.CreateDirectory(tempExtractDir);
+
+        try
+        {
+            _extractor.Extract(opts.ZipPath, tempExtractDir);
+        }
+        catch (Exception ex)
+        {
+            _log.Error($"Extraction failed: {ex.Message}");
+            Cleanup(tempExtractDir);
+            return ExitCodes.ExtractFailed;
+        }
+
+        try
+        {
+            _installer.Install(tempExtractDir, opts.InstallPath);
+        }
+        catch (Exception ex)
+        {
+            _log.Error($"Install failed: {ex.Message}");
+            Cleanup(tempExtractDir);
+            return ExitCodes.InstallFailed;
+        }
+
+        Cleanup(tempExtractDir);
+
+        try
+        {
+            _proc.StartApp(opts.InstallPath, opts.AppExe, opts.RestartDelayMs);
+            return ExitCodes.Ok;
+        }
+        catch (Exception ex)
+        {
+            _log.Error($"Restart failed: {ex.Message}");
+            return ExitCodes.RestartFailed;
+        }
+    }
+
+    private static void Cleanup(string dir)
+    {
+        try { Directory.Delete(dir, true); } catch { /* ignore */ }
+    }
+}