The most straightforward way to ensure your game is current is through the official eShop channels.
For enthusiasts or those managing their digital library offline, the term "NSP" refers to the file format used to install games and updates on the Switch. lost castle switch nsp update eshop
Update files are separate NSPs. When installed, they overwrite specific data in the base game to bring it to the current version (e.g., v1.1.5 or higher). The most straightforward way to ensure your game