You need an installer homebrew app. The standard is TinWoo or Awoo Installer.
If your SD card is formatted to FAT32 (which is standard for Switch CFW), files larger than 4GB must be split.
The Nintendo Switch uses eMMC storage, which requires free space for system operations (over-provisioning). diablo iii eternal collection switch nsp cap
Official Nintendo cartridges and digital downloads often contain "padding" (dummy data) to fill the storage blocks or to optimize read speeds. A standard NSP file dumped from a cartridge or eShop often contains this padding.
The file size isn't just a number; it tells a story about the development history of the game and why this specific port is so highly regarded. You need an installer homebrew app
1. The "Puzzle Piece" Optimization The "useful" part of this story is how developers Iron Galaxy and Blizzard managed to shrink a game that is massive in scope down to such a small footprint. On PC and PS4, the game can occupy upwards of 40-50 GB with high-resolution assets.
To get the game down to ~13 GB on Switch, the developers didn't just compress textures; they rewrote how the game streams data. They utilized a technique where the cartridge (or digital file) doesn't load the entire world at once but streams the "rooms" of the dungeon dynamically. This is why the Switch version has virtually no lag in gameplay despite the hardware limitations—the file structure was rebuilt to be lean and efficient. the developers didn't just compress textures
2. The "Metroidvania" Approach The small file size (the "cap") contributes directly to the game’s best feature on Switch: Instant Resume.
Because the save file and game state are relatively small and efficiently structured, the Switch is able to utilize its sleep mode better than almost any other game. You can suspend the game mid-boss fight, put the Switch to sleep, come back three days later, and resume instantly. This changed the "story" of Diablo from a game you play at a desk for hours, to a game you play in 15-minute bursts on the subway. The modest file size makes this "pick-up-and-play" lifestyle possible without lengthy loading screens.
3. The Complete Package The file size includes the Reaper of Souls expansion, the Rise of the Necromancer pack, and the Ganondorf armor exclusives. The story here is value: you are getting the entire lifespan of a game that ran on PC servers for a decade, wrapped in a package smaller than a high-resolution movie file.