Are you able to download single videos? Also, please make sure you are signed into RealPlayer to activate your Downloader Express.
Can you please let us know the following information:
1. Please go to C:\Program Files (x86)\Real\RealPlayer.
2. Right click on videodl and click Properties and then the Details tab.
Please provide us with the version number you see there.
Could you also provide us with a sample URL that you are trying to download?