If you want the Diablo III: Eternal Collection experience without piracy:
While discussing the technical aspects of NSPs is permissible, it is crucial to state the following:
To understand why people seek out this NSP, one must appreciate the technical achievement: Diablo III Eternal Collection SWITCH NSP -DLC U...
The NSP release, if installed on a fast microSD (UHS-I class), performs identically to the legitimate eShop version because it is the same data, only lacking cryptographic signature verification.
In the context of Nintendo Switch homebrew and digital preservation, the terms "NSP" and "-DLC" refer specifically to file formats and structures used for digital software installation, often outside of the official Nintendo eShop ecosystem. If you want the Diablo III: Eternal Collection
Note on Legality: It is important to distinguish that NSP files are primarily used in the context of digital preservation and homebrew software. Distributing or downloading these files without owning a legitimate license (owning the physical cartridge or having purchased the digital game) constitutes piracy, which is illegal and violates copyright laws.
For educational purposes only, this is how a theoretical "-DLC U..." release works: The NSP release, if installed on a fast
Note: This process degrades game preservation efforts because it encourages dependency on scene groups rather than legal archives.