On Windows 7 Ult x64 the trainer is working nearly perfect! There is 2 or maybe 3 places the trainer don't work. The trainer also seems to freeze some enemies and can make some enemies(very few) immortal. Turn of god mode and they also is mortal again!).
In the arena 1 opponent will be immortal as you with the god mode option turned on, but to overcome that problem. Kill every mortal enemy and then turn of god mode and kill the last!
(Spoiler warning!) About the frozen enemies(As an example!): When I had the trainer activated the 3 headed dog was frozen. I had to quit the game and then load it again to get the dog to become active and attackable! I activated the trainer when it was moving around... And then turning on god mode(Had to turn the god mode of again since the dog also was immortal :| ).