i hear "trainer activated" and am following the instructions. the game freezes every time i try for option 1 even though it declares itselfed activated upon pressing keypad 1, all other keypad functions cease to have any effect on the game, however the "activated" sound always accompanies it.
This seems to be a real issue for the Retail version of GOTY. I'm having the same issue and I've tried all of the other trainers and none of them work.
I then reverted back to the "09092012 GOTY" trainer and tried to activate the option #1 (Unl. Health) and I get "Activated" and straight away followed by "Deactivated" automatically - this is the point where the game crashed.