The primary update for Monster Hunter Generations Ultimate (MHGU) available as an for Nintendo Switch is Version 1.4.0
Version Stability: v1.4.0 is the definitive update that finalized the game's massive roster and system balance.
Emulation & Mods: For players using community tools, version 1.4.0 is the most widely supported. Popular mods, such as the 60FPS and 4K Resolution mods, are specifically built for this version.
If you are looking to verify the file, here are the specs for the Monster Hunter Generations Ultimate Update NSP:
Option 2 UPDATE ALERT! Monster Hunter Generations Ultimate NSP users, rejoice! The latest update is live, bringing fresh content to the game. New monsters, quests, and features are waiting for you. Dive back into the world of Monster Hunter and experience the ultimate hunt! #MonsterHunter #GenerationsUltimate #Update