One, just for clarification, BI doesn't lock out playing the RTW as it was originally put out? Kinda like Starcraft and Broodwar, you can play Broodwar, or you can choose to play the original. You can choose BI, or you can chose the original campaign where you can play as the romans or anyone else?

can i install it mid campaign and keep playing, or should it be used with a clean game, no old saves, or old saves will work?