On your PC, open the new drive that appears and navigate to Drag and drop your extracted .nsp file into that folder.
If you are using an emulator like Ryujinx or Suyu , you can typically install the update by going to File > Install File to NAND and selecting the .nsp file. DIGISURV-(USA)-NSwTcH-NSP-Update103-Ziperto.rar
If prompted for a password, it is almost certainly ziperto.com (this is the standard password for that site). On your PC, open the new drive that
How to Install NSP Files from SD card to the Nintendo Switch using Tinfoil!!! On your PC