I just downloaded the Revenge of Revan mod and installed it. It runs great with no problems, but I decided I would play through the main quest again before I played the mod. Only problem is when I go to open the game, whether I use the normal Launcher or the modded launcher, it always opens to the RoR mod.
Any idea's on how to fix this?
Revenge of Revan is a total conversion mod, I believe, meaning it completely overrides the main quest. You'll have to uninstall it to play the regular game again.
Your best bet would be to copy your entire SWKotor2 folder and rename it to SWKotor3, or whatever makes you happy. Then install RoR into the duplicate renamed folder so you can player Kotor II and Revenge of Revan.