Quote Originally Posted by Long lost Caesar
ah, looks like i'll have to get those patches then. can anyone link me them, since i can't remember what versions there are and i can't even find a site that has them! (i'm pretty sure it was v 1.2, 1.4 and 1.6, but i could be wrong) cheers
No you don't. You only need 1.3, 1.5 and (assuming your BI doesn't come with it) 1.6. All are on totalwar.com.

I've discovered that you can indeed move between BI and RTW as your executables with the same saved game. However you need to reinstall each time you switch or things don't work. Probably a 1.5 v 1.6 compatibility thing.