private void myWebClient_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
        {
            if ((e.Error != null))
            {
                this.OnHandledException(new HandledExceptionEventArgs(e.Error));
            }
            else
            {
                if (e.UserState is Version)
                {
                    this.OnDownloadUpdate((Version)e.UserState);
                }
                else if (e.UserState is DownloadFileMeta)
                {
                    DownloadFileMeta state = (DownloadFileMeta)e.UserState;
                    if ((state.State == "downloadupdater"))
                    {
                        this.RaiseEventStepChanged("Downloading new version");
                        using (FileStream fsss = new FileStream(this.UpdaterPath + ".7z", FileMode.Open, FileAccess.Read, FileShare.Read))
                            if (SharpCompress.Archives.SevenZip.SevenZipArchive.IsSevenZipFile(fsss))
                            {
                                fsss.Position = 0;
                                using (SharpCompress.Archives.SevenZip.SevenZipArchive archive = SharpCompress.Archives.SevenZip.SevenZipArchive.Open(fsss))
                                    using (SharpCompress.Readers.IReader reader = archive.ExtractAllEntries())
                                        while (reader.MoveToNextEntry())
                                        {
                                            if (!reader.Entry.IsDirectory)
                                            {
                                                if (reader.Entry.Key.EndsWith(".exe", StringComparison.OrdinalIgnoreCase))
                                                {
                                                    using (FileStream fs = File.Create(this.UpdaterPath))
                                                        reader.WriteEntryTo(fs);
                                                    break;
                                                }
                                            }
                                        }
                            }
                            else
                            {
                                this.OnHandledException(new HandledExceptionEventArgs(new FileNotFoundException("Updater not found", this.UpdaterPath)));
                            }

                        try
                        { File.Delete(this.UpdaterPath + ".7z"); }
                        catch { }
                        this.OnProgressBarStateChanged(new Events.ProgressBarStateChangedEventArgs(Forms.MyMainMenu.ProgressBarVisibleState.Percent));
                        this.myWebClient.DownloadFileAsync(this.UpdateUri, Path.ChangeExtension(Leayal.AppInfo.ApplicationFilename, ".update-" + state.Ver.ToString()) + ".7z", state.Ver);
                    }
                }
            }
        }
        protected virtual void OnDownloadUpdate(Version ver)
        {
            this._CurrentProgress = -1;
            string thePath = Path.ChangeExtension(Leayal.AppInfo.ApplicationFilename, ".update-" + ver.ToString());

            this.RaiseEventStepChanged(LanguageManager.GetMessageText("SelfUpdate_ExtractingUpdates", "Extracting Updates"));
            using (FileStream fssss = new FileStream(thePath + ".7z", FileMode.Open, FileAccess.Read, FileShare.Read))
                if (SharpCompress.Archives.SevenZip.SevenZipArchive.IsSevenZipFile(fssss))
                {
                    fssss.Position = 0;
                    using (SharpCompress.Archives.SevenZip.SevenZipArchive archive = SharpCompress.Archives.SevenZip.SevenZipArchive.Open(fssss))
                        using (SharpCompress.Readers.IReader reader = archive.ExtractAllEntries())
                            while (reader.MoveToNextEntry())
                            {
                                if (!reader.Entry.IsDirectory)
                                {
                                    if (reader.Entry.Key.EndsWith(".exe", StringComparison.OrdinalIgnoreCase))
                                    {
                                        using (FileStream fs = File.Create(thePath))
                                            reader.WriteEntryTo(fs);
                                        break;
                                    }
                                }
                            }
                }
                else
                {
                    this.OnHandledException(new HandledExceptionEventArgs(new FileNotFoundException("Update content not found", thePath)));
                }
            try
            { File.Delete(thePath + ".7z"); }
            catch
            { }
            this.OnProgressBarStateChanged(new Events.ProgressBarStateChangedEventArgs(Forms.MyMainMenu.ProgressBarVisibleState.Infinite));
            this.RaiseEventStepChanged(LanguageManager.GetMessageText("SelfUpdate_RestartToUpdate", "Restarting application to perform update."));
            using (Process theProcess = new Process())
            {
                theProcess.StartInfo.FileName  = this.UpdaterPath;
                theProcess.StartInfo.Arguments = Leayal.ProcessHelper.TableStringToArgs(
                    new string[] { "-leayal", $"-patch:{thePath}", $"-destination:{Leayal.AppInfo.ApplicationFilename}" }
                    );
                if (Leayal.OSVersionInfo.IsVistaAndUp)
                {
                    theProcess.StartInfo.Verb = "runas";
                }
                theProcess.Start();
            }
            Environment.Exit(0);
        }