On the MBA, there is no folder as named in the Adobe instructions (Mac OS: /Library/Application Support/Adobe/Bridge CC Extensions).
To me this seems to indicate you are looking in the wrong library.
The give path for install needs to be done in the library from your system itself: MacBookAir (or the name you gave it) / Macintosh HD (or the custom name you gave to your start up disk) and then library / App sup / Adobe/ Bridge CC Extensions
I believe you are trying to install in the user library and there is only a BridgeCC folder
Thank you, Omke.
That was it. I am aware of the difference, but had overlooked that situation.