To install the Super Mario Party Jamboree Update 1.1.1 (NSP format), you must have a modded Nintendo Switch running Custom Firmware (CFW) like Atmosphere or a compatible emulator on PC. 1. Extract the Archive The file is likely compressed. Use a utility like
Online Stability: Fixed a bug where a player's nickname length could cause the session to end abruptly when hosting a "Tag Match" in Minigame Bay. Super-Mario-Party-Jamboree-Update-1.1.1.NSP.rar
For the homebrew enthusiast: Understand the risks. Every download of a pirated NSP increases the chance of a console ban. If you must explore, do so on an emuNAND with Wi-Fi disabled and never connected to your Nintendo account. To install the Super Mario Party Jamboree Update 1
Recommendation:
.NSP to SD card.