Hello, please give us more details.

Hello, what's your app version (can be checked by pressing "Alt" < "Help")?
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, 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

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, 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 site is not on the list of supported resources. The full list can be found here: http://en.savefrom.net

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.
Thank you for contacting Savefrom.Net support !

Hello, install our Ummy Video Downloader program, using it you can download high quality video with sound: http://videodownloader.ummy.net/en/#what-block

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

https://en.savefrom.net/faq.php#ext_inst_chrome

Clean your browser's cache and cookies.