Are you installing this update on a or an emulator ? What current version of the game do you have installed? Are you encountering any specific error codes during setup?
Do you need help understanding safely?
A file is a compressed archive. Distributors bundle the NSP update inside a RAR file to reduce the file size for faster downloading and to protect the core data from corruption during transfer. To use the update, you must first extract the .nsp file using software like WinRAR, 7-Zip, or Unhandled archive extractors. Safe Installation and Best Practices pokemon scarlet nspupdate 301rar link
A: No. The update patches the base game. The DLC is a separate, large download (or series of NSP files). You need the base game, the 3.0.1 update, and the DLC files installed to access the full experience. Are you installing this update on a or an emulator
Connect your Nintendo Switch console to a secure internet network. Do you need help understanding safely
Pokémon Scarlet Update 3.0.1: Features, Changes, and File Safety Guide