for offline play, the underlying 2.6 software version is what defines the gameplay experience. Key Features & Gameplay Review
If you installed it on a hacked Switch and the console behaves strangely, restore a NAND backup or reflash your firmware.
The term "nspupdate" seems to relate to file updates for Nintendo Switch games, possibly packaged in a specific format for digital distribution. Nintendo Switch games are typically distributed through the Nintendo eShop, and updates are managed through the console's system software. However, details about a specific "nspupdate 10260rar repack" for Diablo II Resurrected might relate to a custom or pirated version of the game, which isn't officially supported or acknowledged by Blizzard or Nintendo, as Diablo II Resurrected isn't officially on the Switch.