The Conversion Pack is a comprehensive add-on to the original Battlefront II. It adds 25 new maps - including all of the maps from Battlefront 1 not originally featured in Battlefront 2, 5 new gamemodes, a new era, and a substantial amount of expanded unit content to the original game.
This is a good mod, it brought back some of the good maps of the original Battlefront, coupled with the Kotor era, added modes, overhauled gameplay and added maps from the expanded universe, this isn't a mod, it's an expansion to the experience, more of the same...
...and who says it's a bad thing?