Hello, how is the name of the application you installed?

From which site did you install it?

What is your OS?

For the better understanding it'll be great to see a screenshot with the error. 

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

Hello, install the Savefrom extension.

The information how to install the extension to Google Chrome browser
can be found here: http://en.savefrom.net/faq.php#ext_inst_chrome

Hello, in order to remove the extension Savefrom you need to remove Tampermonkey from the extensions.

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

For the better understanding it'll be great to see a screenshot with the error. 

Hello, Unfortunately, we don't fully understand you... please. provide us with more details regarding the issue.

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

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.
We are waiting for your reply, and thank you for contacting us Savefrom.net Team!

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

Before downloading a video, hold down the <Alt> button and then the download button.

Hello, 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.