To clear some things:
1. you don`t need both RTRPE v1.8 and RTRPE v1.9
2. about the path of the install Maced0n can give more info, but I don`t think you should have moved that folder. Can you confirm that you are using the mod switch version of RTRPE v1.9 and not the simple one? The have a different path for their files.
3. if you do have the mod switch version did you use the desktop shorcut it has created for itself to start the game?