Hello, how is the name of the site from which you want to download the mp3?

Do you use the extension or the site Savefrom.Net?

How is the name of the program for which you paid the money?

Здравствуйте, на данный момент уже ведутся работы над исправлением ошибки.
В ближайшее время будет релиз расширения с исправлением.
Спасибо за понимание!

Thank you for using our extension SaveFrom.net Helper

Hello,
You are probably using Google Chrome.
Go to Tampermonkey settings, enable Advance settings mode -> Downloads BETA -> Download Mode: browser api.
Restart TM – everything should be working.

How is the name of the program you bought?

Hello, please write to this address about your problem: support@ummy.net

Hello, Please, let us know what is the name of the program you are using for downloading videos?

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!