DBI is highly recommended because it automatically removes old updates when a new one is installed, saving SD card space.

: Plug your Switch into your PC via USB-C. A new drive icon for the Switch will appear in your PC's File Explorer. Copy Files :

: Your Return to Monkey Island base NSP and the v1.0.3 update NSP. If they are inside a .rar file, you must first extract them on your PC using 7-Zip or WinRAR . USB-C Cable : To connect your Switch to your PC. Installation via DBI (Recommended)

: Select "Run MTP responder" in the DBI menu.