You will not have any problem using it with all those ip addresses and domains blocked. It is recommended to do it. But your problem is not consistent with data leakage past your firewall, because a desired behavior for the developer would be to lock you out of the plugin completely.
I'm not saying it is impossible, just highly unlikely. I think your problem is something else.

What are your OS, DAW and system details like content on external drive, settings.json file edited to match library location? What version were you using when it worked last? Have you tried removing it completely and then reinstalling a fresh copy?

There are quite a few ways you could run into your situation, I just think you would want to focus on other causes than wether it is online or not. You could easily disable your internet and test it while offline.

 

The problem is with your computer, works perfectly for me.