To Install:
1- Go to /XCom-Enemy-Unknown/XEW/XComGame/CookedPCConsole
2- Rename XComGame.upk.uncompressed_size to Whatever
3- Rename XComGame.upk to XComGame.bak or whatever
3- Copy the XComGame.upk file included into the /XCom-Enemy-Unknown/XEW/XComGame/CookedPCConsole folder. 
4- Start a new game.