Easiest way is to just download nut.exe to the directory where your NSP's are, and start it. Will install NSP's from your PC to the switch via USB or network connection. The games will show up on the switch (in the "new games" section) to install, the PC client is just a dumb server. Default username and password is guest/guest for network install.
# USB Install
Run server.py or Windows users can use the precompiled nut.exe in the release section.
Follow the directions found in the release page to install the USB driver.
After you run the server, ensure NSP's are visible in the list. If they are not, change the path and click the "scan" button.
Connect your USB cable from your switch to your PC.
Start Tinfoil or SX Installer, and all of the NSP's listed in nut server should now be available to install in Tinfoil or SX Installer.
# Network Install
Run server.py or Windows users can use the precompiled nut.exe in the release section.
After you run the server, ensure NSP's are visible in the list. If they are not, change the path and click the "scan" button.
Start Tinfoil or SX Installer, then go to locations, then select "Add New" location. Enter the ip, port, username, and password that is displayed in the nut server application, then press save.
All of the NSP's listed in nut server should now be available to install in Tinfoil or SX Installer.
https://github.com/blawar/nut/releases