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, we know about this, our developers are finding out what is the cause of the error.

While you can use the photo saving functionality through the browser,

Right click on photo and save as.

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

Hello, please give us more details.

Здравствуйте. Постараемся отремонтировать в близлежащее время.

Hello, we know the problem, our developers find out what is the cause of the error.

While you can use the photo saving functionality through a browser, for example in Google Chrome,

Right click on photo and save as.

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 !

Hi. We'll try to fix it ASAP.

Hello, thank you for the information.
Our developers will find out what could be the problem and try to fix it.

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