Hi man !!!
I do not have Win10... but this tip can help you... try it...
* I did not need to do this because I use Win XP to play GP3....
1. Click on GPxPatch.exe with the right button ( property - compatibility )
2. Mark.... Run this program in compatibility mode and choose Windows 98 / Windows Me
3 . Mark.... Run this program as administrator
4. Click OK
Test now....
Before install any MOD let the game with the original mode.... test it, is it okay ????
After, step by step, apply new feature and test... okay ???
and so go on...
If you install all maybe you do not know where is the problem....
regards
Evandro ( Brazil )