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

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

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
Could you please send a few links you can't download. We will check it out.
Do you download via the extension SaveFrom.net Helper or the website SaveFrom.net?
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:
https://en.savefrom.net/faq.php#ext_inst_chrome

Hello, it's not our fault that youtube decided to get rid of 3gp . There is nothing we can do about it.

Hello, Reinstall the extension after an older version is uninstalled: 

https://download.sf-helper.com/mozilla/helper_last.html

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 links that you can’t download.

Thank you for contacting Savefrom.Net support !

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, please, send us more details regarding the problem.

Hello, there was an update with a bug fix.
Ummy Video Downloader OS Windows 1.10.4.​​​0
Ummy Video Downloader OS MAC 1.69
Please update or reinstall from our website: https://videodownloader.ummy.net

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
Could you please send a few links you can't download.
For the better understanding it'll be great to see a screenshot with the error.