Problem with UAC when downloading a exe using WebClient

Hi,

I'm using this to download a application (exe) from the web:
webClient = new WebClient();
webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);
webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(ProgressChanged);
webClient.DownloadFileAsync(new Uri(downloadpath), file);

This works fine if UAC is disabled and also when UAC is enabled as long my application is not installed to the "Program Files".
If UAC is enabled and my app try to download an exe using the WebClient fiddler doesn't show any action that I try to download anything (so no error message for sure).
In case I download a zip archive anything works fine ...

Is there a workaround to let the WebClient download an exe also when UAC is enabled and the downloading app is installed to the "Program Files"?

Thanks

Andre