If using custom firmware (CFW), tools like DBI or Tinfoil allow you to install the update NSP separately. You can also "bake" updates and DLC into a single file for easier management. Common Issues
For those using backups or homebrew, NSP update files are used to manually patch the base game. It is critical to match the update region with your base NSP to avoid installation errors. How to Update
Many players on Reddit have noted that despite being available on the eShop, the Switch version does not receive the same seasonal events or new dwellers (like Lucy or Maximus) as other platforms.
If you cannot access the store to check for updates, ensure your system firmware is current or consider changing your account region if you are trying to access a specific regional update. Easily Add Updates & DLC To Nintendo Switch Games - Windows