Very likely you need to launch the game through the Steam client (Play button) or look up the game's installation location and launch the 32-bit game manually.
The two latest trainer versions are written for the 32-bit version of the game.
I have had no ability to pick.. the game just launches 32 bit version on my 64 bit machine automatically.
Trust me, I was/am ****ed I had to start over on this trainer and make a new trainer. I see no other .exe other than the one that launches and is 32 bit.
best,
Cal