I running OS X El Capitan version 10.11.2 on a mac with 14 gigs of memory, 2.7 GHz Intel Core i5 proccesor, AMD Radeon HD 6770m 512 MB graphics on 27 inch iMac. None of the games that i download here work and say "The application "<name of game>" can't be opened."
This has happened for games that are listed under OS X catergory. This has happened with every game here except Tube Tycoon.