I cannot download videos from instagram and from other sites

Hello! Our help will be more effective, if you copy and send us info about your browser and the Savefrom.Net extension:
http://en.savefrom.net/user.php?info=1
We'd also need some links you can't download (to test them).
For the better understanding it'll be great to see a screenshot with the error. 

Do you download via the extension SaveFrom.net Helper or the website SaveFrom.net?
We are waiting for your reply, and thank you for contacting us Savefrom.net Team!