Regarding your specific search terms for an "NSP" and "update":

To grab your copy and dive into the action, you can visit the The Mummy Demastered for Nintendo Switch on the Nintendo eShop . Ensuring Your Game is Updated

The game rewards backtracking once you unlock the "Caster" abilities.

Yes, NSP files are not recognized by a stock, non-hacked Switch. If your console is unmodded, you must update via the official eShop.

To ensure you are playing the definitive, polished version of the game, always verify that your Nintendo Switch home screen displays the latest version number.

For users searching for the NSP version (often for offline installation, modding, or preservation on custom firmware like Atmosphere or ReiNX), here is what you need to know.

The game received a major technical overhaul (v1.0.2) that significantly improved the experience:

The Mummy Demastered is a side-scrolling action game that follows the story of Imhotep, the resurrected Egyptian mummy. Players take on the role of Imhotep as he navigates through treacherous tombs, battles fearsome creatures, and uncovers ancient secrets. With a mix of exploration, puzzle-solving, and intense combat, The Mummy Demastered offers a thrilling experience for fans of the horror genre.

Pros:

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Downloading copyrighted NSP files from unauthorized sources is illegal in many jurisdictions and violates Nintendo’s terms of service. This article is for educational and preservation purposes only. If you own a legitimate cartridge or digital license, creating your own backup NSP via a modded Switch (using software like nxdumptool) is the only legal method.

WayForward quickly released to address these issues.

When The Mummy Demastered launched, it received praise for its dark atmosphere, exceptional chiptune soundtrack, and challenging gameplay. However, early adopters faced significant balancing issues. WayForward addressed these concerns through critical post-launch updates. Version 1.0.1 and Beyond: Major Rebalancing