I'm on Mac and this is happening to me as well. I really wanted to be able to fully play this game!
I was able to fix the problem! I just deleted and downloaded the game again and I dragged the game into the applications folder, then i duplicated it to put it on my desktop. Then you just right click on the game and select open or else it will say that the developer is not registered. I dont know if it will help but it fixed it for me:)!