From the CHEAT HAPPENS FAQ:
Q: Why aren't there any cheats for multiplayer games or modes on your site?
A: CHEAT HAPPENS does not support or condone the use of cheats in a multiplayer environment.
I've replaced it with an add EXP option, guess that makes it easier. Will be posted soon.
EXP multiplier has been replaced. Infinite health has been fixed. Please make sure you are using the latest trainer by deleting yours and download the latest trainer again.
Thanks yet again man, awesome response.