After you have updated your game to version 2.0, in order to acquire the Booster Course Pack,
you will need to go to the Switch eShop and search for Mario Kart 8 Deluxe and manually download the new DLC.
After you have updated your game to version 2.0, in order to acquire the Booster Course Pack,
you will need to go to the Switch eShop and search for Mario Kart 8 Deluxe and manually download the new DLC.