In your emulator, install the update/DLC via the "Install to NAND" or "Install File" menu rather than trying to "Open" it directly. Method 2: Update Keys and Firmware

If missing, extract from a known-good base NSP and rebuild.

If the file was converted or downloaded, the archive structure might be fundamentally broken. Re-dumping the game from your own cartridge using nmdumptool

Conclusion The "NSP file is missing a ProgramType NCA" error points to a missing or misidentified executable content archive inside the package. Diagnosis involves inspecting NCAs and metadata; fixes include restoring the program NCA from a valid source, correcting mislabelled headers by repacking, or rebuilding the NSP using reliable tools. Validate the rebuilt package and ensure legal ownership before proceeding.