UpdateService.cs

public class UpdateService : IUpdateService
{
    public async Task<UpdateInfo> CheckForUpdates()
    {
        try
        {
            bool restart = false;
            string latestExe = "";

            using (var mgr = new Squirrel.UpdateManager(@"http://x.y.z/AppName/Releases/"))
            {
                var updates = await mgr.CheckForUpdate();
                if (updates.ReleasesToApply.Any())
                {
                    Log.Information($"Update Service - New version avaliable ");

                    var lastVersion = updates.ReleasesToApply.OrderBy(x => x.Version).Last();

                    Log.Information($"Update Service - New version avaliable - last version: {lastVersion.Version.Version.ToString()}");

                    await mgr.DownloadReleases(updates.ReleasesToApply);
                    await mgr.ApplyReleases(updates);

                    Log.Information($"Update Service - New version avaliable - downloading release");

                    latestExe = System.IO.Path.Combine(mgr.RootAppDirectory, string.Concat("app-", lastVersion.Version.Version.Major, ".", lastVersion.Version.Version.Minor, ".", lastVersion.Version.Version.Build, ".", lastVersion.Version.Version.Revision), "IsicCheck.exe");
                    restart = true;

                    Log.Information($"Update Service - New version avaliable - Lastest EXE file: {latestExe}");
                }
                else
                {
                    Log.Information($"Update Service - No new updates");

                    return new UpdateInfo(false, String.Empty);
                }
            }

            if (restart)
            {
                return new UpdateInfo(true, $"\"{ latestExe}\"");
            }
            return new UpdateInfo(false, String.Empty);
        }
        catch (Exception e)
        {
            Log.Information($"UpdateService - CheckForUpdates Exception: {e.Message}");
            //MessageBox.Show(e.Message);
            return new UpdateInfo(false, String.Empty);
        }
    }

    public void RestartApp(UpdateInfo info)
    {
        try
        {
            if (info.IsUpdateAvaliable)
            {
                Log.Information($"Update Service - Update found - Application will restart");

                Squirrel.UpdateManager.RestartApp(info.LatestExePath);
            }
        }
        catch (Exception e)
        {
            Log.Information($"UpdateService - RestartApp Exception: {e.Message}");
        }
    }
}