To resolve this issue, please follow the steps provided in the below article:
If that doesn't help, I suggest that you download using the alternate download method by consulting this article:
If you are still unable to download videos, please provide the following information:
• Is this happening to all videos, on all sites or just with a particular one? If the problem is with a particular video, please include the URL from which you're trying to download.
• What version of RealTimes or RealPlayer is installed? (See https://customer.real.com/hc/en-us/articles/204039513)
• What is the operating system of your computer (Windows XP, Vista, 7, 8, 8.1, 10)?
• Do you have any security software installed (Norton, McAfee, AVG, etc.)?
The more specific you are, the better I will be able to assist you.