Since the base game is likely larger than 4GB, you cannot simply copy it to a FAT32-formatted SD card. Instead, use a USB installation method:
If you are downloading from Ziperto, you may need to navigate through link shorteners to hosts like or SendCM . Step 2: Extract the Game File OPPW3-DE-NSwTcH-[BASE]-NSP-Ziperto.part1.rar
: The software will automatically pull data from all other parts to create a single .nsp file (the digital game format for Switch). Step 3: Install the NSP to Your Switch Since the base game is likely larger than
: Select "Extract Here" or "Extract to [Folder Name]" . OPPW3-DE-NSwTcH-[BASE]-NSP-Ziperto.part1.rar