Nintendo releases patches to fix bugs, add icons, and enable DLC compatibility. You cannot play Wave 6 without the latest game update.
The evolution of Mario Kart 8 Deluxe Nintendo Switch represents a landmark in live-service-style support for a premium Nintendo title. Since its 2017 debut as an enhanced port of the Wii U original, the game has transitioned from a definitive collection into an expansive "ultimate" racing platform through consistent software updates and the Booster Course Pass DLC Mario Kart 8 Deluxe The Definitive Foundations (NSP & Base Updates) mario kart 8 deluxe switch nsp update dlc