Nikon Z9 Mirrorless Camera - Manual (Page 328)

328 Computers: Connecting via Ethernet or Wireless LAN
The Wireless Transmitter Utility
Before you will be able to connect to a wireless or Ethernet LAN, you will
need to pair the camera with the computer using Nikon’s Wireless
Transmitter Utility software.
• Once the devices are paired, you will be able to connect to the
computer from the camera.
• The Wireless Transmitter Utility is available for download from the
Nikon Download Center. Check the version and system requirements
and be sure to download the latest version.
https://downloadcenter.nikonimglib.com/