Your first search should be for Unicorn Overlord XCI . This is the "holy grail" as it usually contains the base game, the latest update, and all DLC rolled into a single, simple file.
If you stumbled upon this keyword, you are likely looking for the latest patch (ver. 1.04 or higher), DLC unlocks, or update files for the NSP (Nintendo Submission Package) format. This guide will break down what these updates do, the version history, file sizes, and—most importantly—the legitimate way to get them, while warning you about the dangers of shady "update links." unicorn overlord switch nsp update link
Press the or - button on your controller to open the Options menu. Select Software Update . Your first search should be for Unicorn Overlord XCI