public void SetDownloadDirectory(string path)
{
if (DownloadDirectory != "")
{
throw new NotImplementedException("Changing of download directory while it has been set before is not supported.");
}
DownloadDirectory = path;
_osuDownloader = new OsuDownloader(DownloadDirectory, 3);
_osuDownloader.ProgressUpdated += OsuDownloaderOnProgressUpdated;
}