Where does one find the update in order to install it?
The designated link (http://support.apple.com/kb/HT20159) doesn't work.
MacBook Pro TouchBar and Touch ID, macOS High Sierra (10.13.1)
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On your Mac.....
Open AirPort Utility (Finder > Applications > Utilities > AirPort Utility)
Click on the picture of the AirPort router
Click the Update button in the smaller window that appears