Unfortunately, this does not depend on the extension and does not depend on the version.

Thank you for using our extension SaveFrom.net Helper

Hello, this does not depend on the Savefrom extension, the extension provides a download link and downloads what VK gives.

Hello, do you download via the extension SaveFrom.net Helper or the website SaveFrom.net?

Hello, please, send us more details regarding the problem.

Hello! Our help will be more effective, if you copy and send us info about your browser and the Savefrom.Net extension:
http://en.savefrom.net/user.php?info=1
We'd also need some links you can't download (to test them).
For the better understanding it'll be great to see a screenshot with the error.
We are waiting for your reply, and thank you for contacting us Savefrom.net Team!

Ok, we will consider your idea. Thanks for using our products!

Hello, where exactly to add?

Have you done everything we recommended to you?

Please, send me the information listed here: http://en.savefrom.net/user.php?info=1

Hello, in order to download MP3 from Youtube you need to install our program Ummy Video Downloader,
Also with the help of it you can download videos in high quality with sound: https://videodownloader.ummy.net