Rome Total War Loader Mr. Damm What Will Happen If I Get The Realism Mode For Rome Total War?

What will happen if I get the Realism mode for Rome Total War? - rome total war loader mr. damm

I get the game Rome: Total War, and I read about the various mods not. The realistic sounds very cool, but I have a question. If you download and install, will replace my original game? Will I still be able to play non-modded to Rome Total War?