Once installation is complete, launch the game from the home menu. Notes Requires the base game installed to function.
Move the extracted .nsp file to your Switch's SD card. Undertale-NSP-UPDATE-ROMSLAB.rar
Use a tool like WinRAR or 7-Zip to extract the .nsp file from the .rar archive. Once installation is complete, launch the game from
Use your preferred title manager (such as Tinfoil, DBI, or Goldleaf) to install the update. Once installation is complete