The "DLC" part of your keyword is where the value lies. The Fire Emblem: Three Houses Expansion Pass retailed for $24.99. It was released in four distinct waves.
Troubleshooting: If the DLC doesn't show up, you likely have a region mismatch. Ensure your Base NSP matches the DLC region (USA/World/JP). The update is usually region-free. FIRE EMBLEM- Three Houses Switch NSP UPDATE DLC
Released alongside Wave 4 of the DLC, version 1.2.0 is considered the definitive way to play. Here is what the UPD adds: The "DLC" part of your keyword is where the value lies
Installation Tip: If you are using Atmosphere or Ryujinx (emulator), you must install the Base NSP first, then the UPD. Installing the UPD out of order will result in a "Software closed because of an error" message. Check Version: Go to System Settings -> Data
When searching for "FIRE EMBLEM- Three Houses Switch NSP UPDATE DLC" on Google or Reddit (r/NewYuzuPiracy, r/SwitchPirates), be wary of:
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