We highly recommend creating a 2nd install of GTR2 for the P&G mod. If you really only have room for one install, completely remove GTR2 first and install from scratch- that includes removing your .plr files. Trust us, you'll be glad you did, this mod is quite finicky and can be unstable if you don't start from the beginning.

1. Install GTR2
2. Update to GTR2 v1.1
3. Install P&G v102. Note some users have to manually tell the installer where the GTR2 directory is, even if it comes up correct by default- hit the browse button and locate it anyway.
4. Install P&G v102 fix
5. Run P&G Terrain patch
6. *Optional* Install GTR2 unlock all tracks patch

That should do it. Post in the forum here if you have trouble.