This usually refers to "Update Version 3.0.3." In the official release of Version 3.0.3, Nintendo introduced minor bug fixes and stability improvements to the game.
As he turned the corner toward his house, the screen flickered. In the rearview mirror of the kart, he saw it. It wasn’t Bowser or Donkey Kong behind him. It was a silhouette of a person sitting in a dark room, holding a Nintendo Switch. Leo froze. The figure in the screen adjusted its grip. mario kart 8 deluxe nspchupdate 303rar full
NSP stands for Nintendo Submission Package. It's a file format used by Nintendo for distributing and installing games and updates on the Nintendo Switch console. NSP files are essentially containers that hold the game or update data, along with metadata and digital signatures to verify authenticity and integrity. This usually refers to "Update Version 3