For some reason today ExpertSDR2 for my pro stopped working. I have tried reloading and all with no luck. The windows version works fine but on my mac, nada. Any thoughts ? The error I get is below.

Only thing that springs to mind is has your Mac updated?
Check in privacy and security settings, something may need allowing.
Also when you reloaded did you completely remove the old one ?

Good luck

Can't find anything with allowing that is not already set. Is there a place other than under "library" that would need to be removed?

I couldn't tell you for sure, been a while since I ran it on Mac.
Maybe someone else knows for sure?