Grand Theft Auto 4 (GTA 4)
not sure what the problem is for you, but this trainer functions for thousands upon thousands who have downloaded it, as well as i just tested it-
He can't make it working on every system till some of your software may block the trainer.
There is no software which work 100% on all PC's.
GTA IV is best example for it.
But then again, if your software works on 90% of all systems, that's still a great achievement if you ask me. 100% is just impossible. Even Windows doesn't run on 100% of all systems.
I think that the people at CH are doing their utterly best to make their trainers working on as many systems as possible.