lightweight variant

CursorLang.Core/Services/IUpdateService.cs

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+using CursorLang.Core.Models;
+
+namespace CursorLang.Core.Services;
+
+/// <summary>
+/// Checking for and installing new versions of the application.
+/// </summary>
+public interface IUpdateService
+{
+    /// <summary>
+    /// It makes sense for this installation to update itself.
+    /// </summary>
+    /// <remarks>
+    /// An application installed from the Store is updated by the Store itself:
+    /// offering a package from elsewhere on top of it will not do — Windows would
+    /// not accept it anyway.
+    /// </remarks>
+    bool IsSupported { get; }
+
+    /// <summary>The version of the running application.</summary>
+    Version CurrentVersion { get; }
+
+    /// <summary>
+    /// Looks for a release newer than the installed one. <c>null</c> means the latest
+    /// version is installed or there is no suitable release in the repository.
+    /// </summary>
+    Task<ReleaseInfo?> CheckAsync(CancellationToken cancellationToken);
+
+    /// <summary>
+    /// Downloads the release package and returns the path to it.
+    /// </summary>
+    /// <remarks>
+    /// <c>progress</c> receives the downloaded fraction from 0 to 1. While the file
+    /// size is unknown — not every hosting reports it — there will be no calls at all.
+    /// </remarks>
+    Task<string> DownloadAsync(ReleaseInfo release, IProgress<double>? progress, CancellationToken cancellationToken);
+
+    /// <summary>Hands the downloaded package over to the Windows app installer.</summary>
+    void Install(string packagePath);
+}