Airport Utility
I have a 3TB Time-capsule and running macOS 10.3 High Sierra, Airport Utility 6.3.1 is not compatable with macOS 10.3. Please advise how I can access setting on my Time-Capsule???
Thank you
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AirPort Utility 6.3.1 is more than 5 years out of date. You don't want that, it is ancient and not compatible with High Sierra.
Your Mac running High Sierra already has the current and most up to date version of AirPort Utility installed.
You can confirm this by opening Finder > Applications > Utilities > AirPort Utility
Open AirPort Utility and click on the AirPort Utility menu in the upper left corner of the screen.
Click on About AirPort Utility
You will see that you have the most up to date version of AirPort Utility, which is 6.3.8