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

Hello. The extension downloads only what Youtube gives.

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.

Information is needed about your browser and extension, it is at the top of the page.

We do not have this opportunity.

The application downloads only the video.

Sorry, we did not quite understand you, we have an application for Android:

http://sf-apps.com/android/SaveFromNet.apk

Hello, 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?

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