To all reading this post. Come on, just think a little. It is so easy to get around this problem.
I also have steam version. There is nothing illegal about getting a backup image of this game if you alrady own it.
Just install a fresh copy of forged alliance retail from disk, this is version 3596 and update to 3599.
The steam version is 3603 beta or something similair. You really only need this if you want to play online which you wouldn't use a trainer for anyway. In addition, there is no reason to ever install the steam version when playing this game because faforever has patched the game to 3614 beta. Lastly, faforever runs completely seperate from any install.