When Luigi’s Mansion 3 launched, it was already a visual treat, but Nintendo has been diligent about patching the experience. The jump to version 4.0 (and the subsequent incremental patches leading up to it, often labeled as 4.0.1) represents a significant stabilization of the game.
While early updates focused primarily on the ScreamPark and ScareScraper multiplayer modes, the later updates generally address:
If you own a retail Switch with no modifications, you do not need to deal with NSP files. Simply: Luigi-Mansion-3-NSP-Update-1---40-1--41-.4.0-Mu...
The only downside is that you cannot access v1.4.0 independently; you will skip straight to 1.4.1.
NSP (Nintendo Submission Package) files are normally used for digital distribution or game dumps. In homebrew or emulation communities (e.g., Ryujinx, Yuzu), users sometimes look for standalone update NSPs to apply to a base game dump. When Luigi’s Mansion 3 launched, it was already
However, downloading these files from unauthorized sources is piracy unless you have legally dumped your own cartridge/ digital copy. Nintendo actively pursues legal action against sites hosting such files.
For users with a hacked Switch (Atmosphère): The only downside is that you cannot access v1
For emulator users (Ryujinx/Yuzu):