I have some older mod files but since there all from 0.35, there's no guarantee they will work in 4.7.0:
(Pick and choose the file you want. Remember to move them to the right folders.)
Okay. First, uninstall the Rigs of Rods program (just delete everything). Then re-install it, look in the "Documents" folder and you should see a folder named, "Rigs of Rods". Next, don't delete ANYTHING in that folder if you still want terrain, vehicles and all the other required functions...