how to mount and crack downloaded mac game?

Hi,
This is my first time posting on Boards, any help would be much appreciated! I downloaded football manager 10 there for my mac but cant seem to mount it properly. I mount the iso, then install the crack and the game plays fine. But when i turn my mac off and start it up again the game can not be played until I mount the iso and install the crack again! Its very frustrating having to do this everytime I want to play it. No instructions came with it when I first downlaoded it. Im sure Im doing something stupid, can anyone please tell me how to get around this?
Thanks in advance!