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private void button2_Click(object sender, EventArgs e)
        {
            WebClient webclient = new WebClient();
            Uri uri = new Uri(this.textBox1.Text);
            webclient.DownloadFileCompleted += new AsyncCompletedEventHandler(DownLoadCompleted);
            webclient.DownloadFileAsync(uri, "MaiLet.exe");
        }

        private void DownLoadCompleted(object sender, AsyncCompletedEventArgs e)
        {
            MessageBox.Show("Erfolg");
        }					

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try
                    {
                        WebClient web = new WebClient();
                        Uri uri = new Uri(@"http://mailet-software.weebly.com/uploads/7/2/0/5/72054763/webstudio_version.txt");

                        web.DownloadFile(uri, "Version.txt");

                        string newVersion = null;
                        string currentVersion = null;

                        using (StreamReader reader = new StreamReader(Path.Combine(Application.StartupPath, "CurrentVersion.txt")))
                        {
                            currentVersion = reader.ReadToEnd();
                            reader.Close();
                        }
                        using (StreamReader reader = new StreamReader(Path.Combine(Application.StartupPath, "Version.txt")))
                        {
                            newVersion = reader.ReadToEnd();
                            reader.Close();
                        }

                        if (newVersion != currentVersion)
                        {
                            Uri description = new Uri(@"http://mailet-software.weebly.com/uploads/7/2/0/5/72054763/webstudio_beschreibung.txt");
                            WebClient client = new WebClient();
                            client.DownloadFile(description, "Beschreibung.txt");
                            string _description = "";
                            using (var file = new StreamReader(Path.Combine(Application.StartupPath, "Beschreibung.txt")))
                            {
                                _description = file.ReadToEnd();
                                file.Close();
                            }

                            Updater updater = new Updater(newVersion, _description);
                            updater.ShowDialog();
                        }					

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try
            {
                var url = new Uri(@"http://mailet-software.weebly.com/uploads/7/2/0/5/72054763/mailet_webstudio_2016.exe");
                var newUrl = new Uri(@"http://mailet-software.weebly.com/uploads/7/2/0/5/72054763/webstudio_version.txt");
                var client = new WebClient();

                File.Delete(Path.Combine(Application.StartupPath, "MaiLet Webstudio 2016.exe"));
                client.DownloadFile(url, "MaiLet Webstudio 2016.exe");
                client.DownloadFile(newUrl, "CurrentVersion.txt");

                System.Diagnostics.Process.Start(Path.Combine(Application.StartupPath, "MaiLet Webstudio 2016.exe"));
                Application.Exit();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }