WRONG! The game does not crash with the 1. METRO 2033 MEGA TRAINER (PATCH #2) on steam.
My game goes for a while, with the trainer active but no cheats on yet, and then just seems to hang.
Playing without the trainer it seems fine.
There doesn't seem to be any specific thing I can see that's making the game crash. It happens mid combat, or just while walking around, or in the middle of a cutscene.