If you are using an emulator (Ryujinx or Yuzu) on PC, you do not need a separate "Switch update." The emulators can install the NSP update directly. However, the game runs better on native hardware.
In the world of console homebrew and digital preservation, "NSP" (Nintendo Submission Package) files are the standard format for Switch digital games and updates. If you are looking for the latest patches, performance fixes, or even the elusive DLC, this guide will walk you through everything you need to know about the updates—including legal alternatives, what the patch actually fixes, and the risks associated with seeking "free" files. alien isolation switch nsp update free