On a standard, unhacked Nintendo Switch, you cannot manually install an NSP file. However, on PC, you can open and run these files using like Yuzu, Ryujinx, or Cemu. These emulators allow users to play Switch games on a computer by loading the game data contained within the NSP file.
The best, safest, and most rewarding way to experience The Mortuary Assistant on Nintendo Switch is by purchasing it through the official channels. The Mortuary Assistant Switch NSP Free Download
Ultimately, whether you're uncovering the grim secrets of River Fields Mortuary for the first time or replaying it to discover a new demon, the definitive and safest way to play is by supporting the creators. It's a small price to pay for a night of terror you won't soon forget. On a standard, unhacked Nintendo Switch, you cannot