I had the same problem with the installer for the update (likely same installer), and contacting Adobe support is irresponsibly difficult to near impossible. I stumbled around and somehow installed the free Creative Cloud App. It may be this one:
but with Adobe's bewildering web site, its difficult to tell. My CC runs all the time and shows up in the Mac menu bar which I do not like.
Finally, I signed in via the resident Creative Cloud app -- not the web page sign-in as that doesn't register with the installer. With CC running, me signed-in there, and starting the installer from scratch would get to the sign-in screen, pause a while, then installer would figure it out and continue to let me enter my serial number. Apparently, the installer is so lame that it cannot figure out if the CC is installed or not; it cannot even offer to install it. It doesn't even tell you that you need to install the CC app.
The problem I have now is that my supposedly standalone LR6 requires me to be signed-in to use it! This does not appear to be a side effect of signing-in to install, but rather Adobe doesn't seem to know the meaning of "standalone". I want to be rid of the CC app and run LR6 as a true standalone, but I suspect that is hopeless. I'd rather have my money back and stick with LR5 which is a real standalone.
Oh that sounds reasonable - and rather ominous. I'll look at that later tonight.
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Doing this helped thank you. Just installing the CC manager was not enough - it started spinning forever when it ran too. But another poster linked me to this: https://helpx.adobe.com/creative-cloud/kb/creative-cloud-app-doesnt-open.html and solution #4 did the trick for me. Then I was able to install.