Do not install via a direct drag-and-drop of the NSP file to your SD root. Use USB install via Tinfoil:
For the update to work, the installation order is critical: namco museum arcade pac switch nsp update work
A weird quirk specific to Namco Museum Arcade Pac: The update checks for a Nintendo CDN (Content Distribution Network) handshake. Do not install via a direct drag-and-drop of
Critical: Do NOT install the DLC before the update. try these solutions:
If you are experiencing crashes, black screens, or the game failing to launch after installing the NSP or update, try these solutions: