is it not letting u open the app b/c your laptop says its from an unknown source? if so go to your system preferences > security & privacy & at the bottom there should be a lock :Light: unlock it by entering your password & look where it says "allow apps downloaded from" it should have PROAPPLE under it & all u have to do is click open anyway! u should be able to play it after that
make sure to click on the lock to save your changes! u can also click "anywhere" before u do that just in case u dont run into this problem again