The common solution to this is to change the order that you launch the game and trainer: "These cheats were made for the 64-bit version of the game, you are running the 32-bit version" - and vice versa - #2 by Ravenfyre
Otherwise, the game received an update on the 10th September to fix the broken stealth mechanics, whereas the trainer’s last update was the 3rd. I’ll make sure that the testers are aware of that. 