If your games start crashing on Mac, the first step would be to check the system requirement of the game. This will let you know if the game can be played in this OS or there are some other requirements. If the game needs some other system requirements, no other step will be helpful other than changing the Mac. So, it is always recommended to check the system requirement first, before purchasing a game.
If you found that system requirement is not the issue, go for updating the game next. The latest versions of the games are always available in the app store if the game is downloaded from the app store. What you need to do is just open the Mac app store and click on the update button located on the top bar. That’s all. The game will be updated. But if no updates are available, it will be shown in the app store.