: Tools like Steam ROM Manager or EmuDeck may have mistakenly linked to the update file instead of the base game NSP.

When downloading NSPs from scene groups, read the .nfo or release notes. A file labeled Game.Name.Update.v1.2.0.NSP should contain ProgramType 2 NCAs. If the file size is suspiciously large (close to the base game size), it is likely a repackaged base game.

: Re-download the base game from a reliable source or try using a tool like Switch Army Knife (SAK) to verify or convert the file to XCI.

: If a specific file consistently fails, it may be a "bad dump" or corrupted download; seek a different source for the base game. The NSP file is missing a Program-type NCA. : r/EmuDeck

Are you getting this error on an or a modded Nintendo Switch console ?

If you only have an update file, yuzu/ryujinx cannot launch it. You must acquire the base game.

Some repackers create "merged" NSPs that combine base + update + DLC. If the repacker made a mistake—placing the update NCA in the wrong section or forgetting to include the base program title ID—the installer will still identify the file as an UPD payload without a ProgramType NCA.