I have upgraded my MAC to Catalina(end of the road for me) and I'm thinking there is a procedure that enables both the GPS map
I just want to clarify: The ability to view maps within Photo Mechanic is dependent on functionality that is baked into your operating system: WebKit. Google decides what versions of Webkit their map supports, so if the version baked into your operating system is not a version that they support, Photo Mechanic will not be able to load the map. Google ended support for the version of Webkit in Catalina earlier this year.
Reverse Geocoding, on the other hand, is not dependent on your operating system. If your image has GPS coordinates, Photo Mechanic should be able to Reverse Geocode them regardless of which OS you are on, so if you continue to experience the issue after deleting the PMDebug file, I will echo what Kirk said and ask you to call or email the support desk.