Please zip/rar the exe and we can see if it changed and we can update to make it work.
You got it, Spoiler:
Unfortunately we are unable to check the code areas in this exe to determine why the trainer at the same version level was working, or at least reported as working, with the GOG version without owning it. If someone would like to gift us the game we will be happy to update the trainer to work with both sources.
I gotcha.
Anyway, it seems like it's only the no-damage option that works intermittently, everything else seems to work fine. If it starts working again solidly in steam, then I'm confident it'll work in gog as well.