the trainer likely works for multiple versions. something is blocking the trainer from having access to the game..
Check your firewall and make sure the trainer is actually making contact with the CH site for the Confirmation check.
Happens to me at times when I download a new trainer, many times turning off my fire wall once will let the trainer authenticate, some times I have to do it every time I load a certain trainer, all depends.
P.S. Thank you guys for doing all the hard work on these wonderful trainers yet again.
Which easy kill are you using? There are two separate easy kill options. If you want to reduce the health of your opponent you need to use option 8 which is called easy kill 2. It reduces the health of player 2 which would be the AI.