Copy the extracted .nsp file into a folder on the SD card (e.g., a folder named install ).
Since the file ends in .rar , you first need to extract its contents on your computer. Use a tool like 7-Zip or WinRAR. GASTATIONSIM-(USA)-NSwTcH-[BASE]-NSP-Ziperto.rar
Are you planning to install this on a or are you using an emulator like Ryujinx or Yuzu? Copy the extracted
Drag and drop your .nsp file directly into that folder; the app will handle the installation automatically. GASTATIONSIM-(USA)-NSwTcH-[BASE]-NSP-Ziperto.rar
On your PC, the Switch will appear as a drive. Open the drive and find the or "NAND Install" folder.