You can download a digital game that you own elsewhere on your Nintendo Switch. You can do this by visiting Romsever.co. Select the game console App Store icon on your home screen. The game will begin downloading once you're done. You should archive another game or download it to your SD card first. After this stage, the process will move more quickly. You can now start using it. If you're using the Nintendo Switch controller, you can download Nintendo Switch Roms to your computer before leaving your house.