Downloading NSPs for games you do not own is illegal. Ensure you are using your own dumped files for these installations. If you'd like, I can help you: Find the latest firmware requirements for the game Walk through updating your SigPatches
If you have a V1 unpatched Switch or a modded OLED/Lite running Atmosphere CFW, follow this: paper mario the thousandyear door nspupdate install
Installing Paper Mario: The Thousand-Year Door via NSP update is straightforward once you understand the interplay between firmware, sigpatches, and correct NSP linking. Downloading NSPs for games you do not own is illegal
If you prefer Goldleaf, the process is similar but slightly older. paper mario the thousandyear door nspupdate install
on a modded Nintendo Switch, you can use several established homebrew tools. The most common update for this game is version