I’m getting a NETWORK FAILED error message when trying to install Stands

This could happen for 1 of 3 reasons:

1. A slow network connection. 
2. Some security software, or perhaps the computer is managed by a company (i.e. your employer) which prevents you from installing extensions. 
3. It might be a malware or a virus on your computer (unrelated to Stands, sorry) that prevents you from installing extensions. 

If you think it's not the network connection, and your anti-virus is fine (or you don't have one), it could quite possibly be option number 3.

In that case, you might want to try and delete Chrome and re-install it. You can also try running the Google Malware Cleanup tool, found here: https://www.google.com/chrome/cleanup-tool/