You do seem to have the correct version of the Downloader. If the Downloader is not able to detect the video, it is mostly likely a conflict with your firewall program. One of the component in Downloader may be blocked by your firewall program. What is the firewall program running on your PC?
Are you able to download videos if you copy and paste the URL?
You can search for YouTube videos within RealPlayer by following these steps.
- Open RealPlayer
- Click the RealPlayer logo from the top left corner and click File --> Open.
- Type in www.youtube.com and click OK.