on AirPort Utility vers. 6.3.8 where download

Apple, Utilities, AirPort Utility, 5033165 KB, Network

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Note: Most recent release available only within OS X 10.13.4 macOS High Sierra update. Use AirPort Utility to set up and manage your Wi-Fi network and AirPort base stations, including AirPort Express, AirPort Extreme, and Time Capsule. See a graphical overview of your Wi-Fi network and devices. Change base station and network settings, or manage advanced features such as security modes, wireless channels, and more.

Apple

http://support.apple.com/kb/DL1664?viewlocale=en_US&locale=en_US

Key list AirPort Utility 6.3.8

X7KXQ-Z9A8B-ZQNOR-MBY3Q

2QVFY-Z1HCB-76JEB-81XCV

KF2XZ-XFDA9-9TJS1-2TXG6

{17394 kbytes} 2.2d

{7741 kbytes} 2.6

{7756 kbytes} 1.3.0

{11707 kbytes} 8.2.8

{6859 kbytes} 3.2

{1887 kbytes} 1.0.5

{4049 kbytes} 5.7.0