i just downloaded the game on steam, run the trainer as admin then ran the game. pressed F1 to activate the trainer in the menu, then loaded my save. used the infinite health option and it worked fine.
so 1 of these steps you are not doing or you don't own the game on steam/uplay?
I own the game on both steam and uplay, ran the trainer on admin forgot to mention that it works fine on the enemies but last version it won't kill me on fall damage and now this version kills me on fall damage.