We can't help you with warez. It's against the forum rules. If you download that type of thing then you do it at your own risk.
Command, Options & Esc to force an activity to stop. (Or sometimes Command & fullstop.) Otherwise open the Activity Monitor in your Utililities folder & cancel it's operation from there.

Make sure the file you downlded is the appropriate size. Size does matter!!! And look around. Don't downld the 1st one you find.