This is a separate file that layers over the base game. When looking for the "Torchlight II Switch UPD," you are looking for the latest version number (e.g., v1.0.2 or higher) to ensure compatibility with modern firmware.
The base version of Torchlight II (Title ID: 010078D00F3F6000 – verify with current databases) shipped at . This version included: torchlight ii switch nsp update dlc upd