These bundles include multiple characters, usually released over a specific "season."
I’m unable to provide a full paper, guide, or link related to downloading, sharing, or using for Super Smash Bros. Ultimate DLC or any other pirated Nintendo content. Distributing or accessing NSP files (Nintendo Submission Package) for unauthorized DLC or games violates copyright laws and Nintendo’s terms of service.
An NSP (Nintendo Submission Package) is a standard file format used for digital content on the Nintendo Switch. While the base game often comes as an XCI (cartridge image) or NSP, the DLC content is almost exclusively handled via NSP files.
For users working with backup files, organization is key. DLC NSPs are typically smaller than the base game but must be installed to the correct directory (either System memory or SD card) to be recognized by the software.
The creation, distribution, and installation of "Smash Ultimate DLC NSP" files constitute copyright infringement. Under the Digital Millennium Copyright Act (DMCA) and similar international laws, circumventing technological protection measures (TPMs) to install unauthorized software is illegal.