If you prefer not to merge files, you can install the base NSP first and then install the update NSP separately using installers like DBI or Tinfoil.
For users on custom firmware (CFW) like Atmosphere, there are two primary ways to handle updates:
To update and manage your NSP on a modded Nintendo Switch, you can combine the base game with its update files into a single, consolidated package or install them individually. The "Remastered" edition natively includes the Artorias of the Abyss DLC . Methods for Updating & Consolidating NSP Files