Something broke in the API since Sunday?

The program I use to download from Derpibooru stopped working since I last used it on Sunday. The program hasn’t been updated in a very long time so I doubt it would be fixed by the developer if it’s something they can fix themselves and I don’t know how to code :/

Nothing should’ve changed. Can you post the error message or a screenshot? Be sure to redact your API key if it’s visible

I tried using the program on another computer and it worked so the problem is on my end it seems.
 
I switched the network profile from public to private and it worked. I’m not sure why that changed :/
 
Thanks, though.