How To Find The Official Football Manager 2012 Editor

The Steam version off data editor will NOT install I keep getting validation failed and files deleted errors trying to use the STEAM suggestions has now made every other game installed under steam fail and need reinstalling without fixing the problem in fact all it has done is apparently corrupt the main game as now if I sack the coaching staff(who are all useless for the team I play) the board says I don't need any more coaches even If I only have one coach which for a championship club is a joke.