: Use a homebrew installation tool (like Tinfoil or DBI) to install the .nsp file to your console's storage.
: Updates are often required to access and play the Splatoon 2: Octo Expansion DLC. Usage and Installation Splatoon-2-USA-NSP-UPDATE-ROMSLAB.rar
This specific package generally includes the following "complete features" for the game: : Use a homebrew installation tool (like Tinfoil
: Ensure your base game is also the USA region version, as updates and DLC are region-locked and will not work if the regions do not match. : If using an emulator on a PC
: If using an emulator on a PC or mobile device, use the "Install Files to NAND" or "Install NSP" option within the emulator's menu to apply the update.
: The update is provided in the .nsp (Nintendo Submission Package) format, which is the standard digital format used for installing games, updates, and DLC on the Switch system.