about Wilsonso's 78 trainer for RE5, PLEASE HELP!!

I am literally one step away from collapsing, cuz I spent like 12 hours(no exaggerations) already just trying to change the MOD using this trainer, but goddamnit it's jut not working for me. Basically, I  open the trainer and the game, select "Frozen",try to change the mod, but a "Error......game not running......;System.IndexOutOfRangeException........"shit just pop up and the current statue of the character remains "N/A"(according to the tutorial it should be  Chris and Sheva's name if it connected to the game properly). I've tried everything I know, I'm not a game expert so I have absolutely no idea what the hell is wrong with it, but I know I'm pissed that's for sure. GOOOOOD, can someone please for the love of god help me ORZ.......
(PS:I have all the necessary software and patches, no idea what's wrong with it.........please tell me it's not because my game version is a free installed one.)