There is no official, single-file "ROM exclusive" package that contains everything out of the box. Users must source the base game, the correct update file, and the DLC unlocker separately, then command their software to read them in tandem. Emulation and the "Exclusive" Digital Content
The most tantalizing theory among hackers is that Nintendo developed test tracks or cut tracks during the BCP's production that never made it to the public eShop. mario kart 8 deluxe booster course pass rom exclusive