Devil May Cry 4
I did follow that link in the other post, PWizard, and I did contact Caliber requesting the trainer update. He replied that he has already sent you the request by January 2013 and before that, in August 2012. His reply is in my private messages and I give you full permission to verify that if you like.
So, I ask you, please, update the trainer to work on Windows 8, will you?