If you have a physical copy, no large "installation" is required to start playing, though minor updates are recommended:
Use the search bar to find Kirby Star Allies . kirby-star-allies-installation-tutorial
Select the orange shopping bag icon from the HOME Menu . If you have a physical copy, no large
The game will automatically begin downloading. You can track the progress on your HOME Menu. Physical Installation (Cartridge) If you have a physical copy