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!

Hello, in order to help you better I need the following information.
Please, send me the information listed here: http://en.savefrom.net/user.php?info=1

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

Could you please send a few links you can't download. We will check it out.

For the better understanding it'll be great to see a screenshot with the error.

Hello, this extension has been fixed. Please, update or reinstall it from our site.
The latest version is 8.81: https://en.savefrom.net/user.php?vid=387#10
Thank you for using Savefrom.Net browser extension

Hello, this extension has been fixed. Please, update or reinstall it from our site.
The latest version is 8.81: https://en.savefrom.net/user.php?vid=387#10
Thank you for using Savefrom.Net browser extension

Hello, reinstall the extension and clear the cache and cookies in the browser.

We checked the video, they download without problems.

Hello, please give us more details.

Hi. We'll try to fix it ASAP.

Hello, we are working hard to fix the error.