If launching via Steam Rom Manager fails but launching from within the emulator works, the shortcut is likely pointing to the wrong file. Delete the shortcuts and rerun Steam ROM Manager with the correct base game paths.

Split archives (like part1.rar , part2.rar ) often fail to extract fully if using outdated tools. Using WinRAR or an updated 7-Zip can sometimes resolve "data error" issues that lead to missing NCAs.

Verify source:

: Ensure you have the base game NSP installed, not just updates. Base games usually have [v0] in the filename, whereas updates have higher version numbers.

If an NSP was downloaded incorrectly or copied over poorly (e.g., using a faulty USB drive), the internal NCA structure may be broken.