Our technical department is currently investigating the problem you describe and they need some additional information to continue their research. Therefore, kindly answer the questions below.
1. Send us some URLs (links) of the videos that cause the error message
2. What Windows version are you using? (Windows 7, 8, 8.1. or 10?)
3. What browser version are you using when downloading? Here's how to tell: Find browser version
4. Go to the following location on your PC and let us know if the you can find the files listed below: C:\Program Files (x86)\Real\RealDownloader
We apologize for the inconvenience caused and appreciate your cooperation.