Hello, in order to help you better I need the following information.
Please, let me know me the name and version of your browser and version of the extension,

all can be found using the following link: http://en.savefrom.net/user.php?info=1

Do you download via the extension SaveFrom.net Helper or the website SaveFrom.net?

Send links to videos that you have downloaded from the wrong name.

Hello, We need some more details to be able to solve this issue.
Can you please send the information about your browser and current extension.
It all can be found here: http://en.savefrom.net/user.php?info=1

Please, send us links for files, which can't be downloaded.

Hello, the error is corrected.

Thanks for using our resources.