Hi Austin,
In my case (i have just re-installed the whole game a couple of days ago) i have just extracted the game (patched version from gp4central) and regulary installed ZAZ tool (just the latest version). No further settings needed in my case (not even compatibility mode) and it just works great.
The only rule i followed was to not install the game (and zaz tool) into the Program Files folder. Just install it to C:\Infogrames\Grand Prix 4 (as some say, Program Files causes some issues).
I recommend you to frist try this "simple way" before trying any further methods. With the latest version of GPxPatch, there should be no need for compatibility mode anyway.
Hope this helps.
Carl
Edited 2 time(s). Last edit at 04/06/2020 09:55PM by Carl_gpgames.