RPS.Config.webUpdateCheck_DocumentCompleted C# (CSharp) Method

        private void webUpdateCheck_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            if (this.webUpdateCheck.Url.Equals(this.getUpdateUri())) {
                HtmlElement he = this.webUpdateCheck.Document.GetElementById("download");
                if (he != null) {
                    Version ignore = null;
                    Version compareTo = this.screensaver.version;
                    //he.Get
                    Version update;
                    try {
                        update = new Version(he.GetAttribute("data-version"));
                    } catch (Exception ex) {
                        this.screensaver.showInfoOnMonitors("Error detecting latest version" + Environment.NewLine + ex.Message, true, true);
                        return;
                    }
                    if (this.getPersistantBool("ignoreUpdate")) {
                        try {
                            ignore = new Version(this.getPersistantString("ignoreVersion"));
                        } catch (Exception) { }
                        if (ignore != null && compareTo.CompareTo(ignore) < 0) {
                            compareTo = ignore;
                        }
                    }
                    if (!this.getPersistantBool("betaVersion")) {
                        // Revision number = 0 for alpha release,
                        // Revision number != 0 indicates beta / release candidate version
                        update = new Version(update.Major, update.Minor, update.Build);
                    }
                    this.newVersionAvailable = (compareTo.CompareTo(update) < 0);

                    if (this.newVersionAvailable) {
                        if (this.downloadUpdates) {
                            string downloadedUpdateLocalPath = Path.Combine(Constants.getUpdateFolder(), Path.GetFileName(he.GetAttribute("href")));
                            if (!File.Exists(downloadedUpdateLocalPath) || !Utils.VerifyMD5(downloadedUpdateLocalPath, he.GetAttribute("data-md5"))) {
                                if (File.Exists(downloadedUpdateLocalPath)) File.Delete(downloadedUpdateLocalPath);
                                this.showUpdateInfo("<div class='downloadProgress'><div class='downloadLabel'>Downloading update: " + update.ToString() + "</div><div class='downloadProgress' style='width: 0%'></div>");
                                Directory.CreateDirectory(Path.GetDirectoryName(downloadedUpdateLocalPath));//.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), Constants.DownloadFolder));
                                WebClient client = new WebClient();
                                client.DownloadFileCompleted += new AsyncCompletedEventHandler(DownloadFileCompleted);
                                client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(DownloadProgress);
                                client.DownloadFileAsync(new Uri(he.GetAttribute("href")), downloadedUpdateLocalPath);
                                return;
                            } else {
                                this.DownloadFileCompleted(this, null);
                            }
                        } else {
                            this.showUpdateInfo("Update available<br/><a href='" + he.GetAttribute("href") + "'>Download RPS " + he.GetAttribute("data-version-text") + "</a>");
                        }
                    } else if (this.screensaver.showUpdateStatus) {
                        this.screensaver.showAllUpToDate();
                    }
                }
            }
        }