: The legality of downloading ROMs and NSP files varies by jurisdiction and circumstance. Generally, downloading ROMs of games you don't own can infringe on copyright laws. For NSP files, even if you're a Switch owner, downloading game content without purchasing it can be considered piracy.
In technical communities, Switch games are often discussed in .nsp (Nintendo Submission Package) or .xci (Game Card Image) formats. Updates are typically distributed as NSPs because game cards (.xci) generally cannot be updated directly once manufactured. curse of the sea rats rom nsp update switch link