Quote Originally Posted by Frunk the Guest
How exactly would I do that? Do I back up my current Total War folder then un-install and re-install the game?
You can simply make a second install of M:TW and VI (you need to do this directly from the CD), and install your mod into the new M:TW folder. Unfortunatly, this doesn't work with R:TW (and BI) however, and if you intend on installing multiple R:TW mods you should manually create a copy of an unmodded R:TW folder.