Hello, 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, thank you for contacting support in Savefrom.Net
This bug is known to us, we will try to fix in the nearby future.

Hello, facebook site does not give higher quality for download.

Hello, send a couple of video links for the test.

What quality are you downloading?

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

After the actions you have done, nothing has changed?

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

Hello, thank you for contacting support in Savefrom.Net
This bug is known to us, we will try to fix in the nearby future.

Reinstall extension

https://addons.opera.com/addons/extensions/details/savefromnet-helper/?display=en

Clean your browser's cache and cookies.

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

Hello, we’d like to help you, but we will need some info about your browser and the installed extension first.
Please, go here http://en.savefrom.net/user.php?info=1
Copy the details that you see and send them back to us.
Please also send us some video links that you can’t download.
What quality are you downloading?

Thank you for contacting Savefrom.Net support !