Download File | Mario Kart 8 Deluxe [dlc] [010015...

A small "check" or "Booster Course Pass" icon will appear on the main menu once active.

If you're having trouble getting the tracks to show up, let me know: Download File Mario Kart 8 Deluxe [DLC] [010015...

Buy the pass individually via the Nintendo eShop. A small "check" or "Booster Course Pass" icon