Shredsauce Controller Not Working

I searchbarred and googled this and could find nothing. I just bought a wired xbox controller from gamestop, and I downloaded the software for the controller about 4 times and it still doesn't work. When I hit play on the main menu it just goes straight to the game. I remember before it would ask me if I was on either mac/pc and keyboard/laptop, now it doesn't. I am using a mac.