void downloader_DownloadFailed(object sender, Net.FileDownloadErrorEventArgs e)
{
rtbLicense.Rtf = Properties.Resources.license;
optAgree.Enabled = true;
}
void downloader_DownloadComplete(object sender, Net.FileDownloadingEventArgs e)
{
rtbLicense.Rtf = System.Text.UnicodeEncoding.Default.GetString(licenseMemoryStream.ToArray());
//System.IO.File.Delete(e.FilePath);
optAgree.Enabled = true;
}