I dont know if this will be any good but you can try this mar:
http://www.filefront.com/5075571/Choose-Between-1.0-and-1.1/
The file is a file called battlefrontii1.0 or something like that. Looks like a startup part of the whole thing. Guess you should put in in the folder where the normal startup file is aswell and then try if this one will open 1.0 (it needs to be in the right folder to be able to find the game folders it needs to start the game). Ive no idea if this works, havent ever tried it myself, but just found it when looking around
Hope it works