Lightroom CC does not start

I have an evaluation copy of Lightroom CC which has been working fine on my Mac, but now suddenly refuses to start. I see the splash screen inviting me to continue the trial, but after I say Continue, that window closes and nothing more happens. I've tried logging out, then logging in, from the CC app, and also deleting preference and cache files. What would be the next thing to try to get it working again?
Thanks very much,
Peter

My effort on Windows 8.1:
* I installed LR5 trial version the day before LR CC 2015 was released.
* I upgraded to LR CC 2015 but could not launch it. Could still launch LR5 trial.
* I uninstalled LR 5
* Multiple efforts at signing out, rebooting, uninstalling LR CC2015, Adobe Cloud, reinstalling same - No Joy
** Note that it still indicated "29 days left in trial" even though it was now 28 days. hmmmm
* Uninstalled LR CC2015 and this time said [x] Remove preferences
* Reinstalled LR CC2015 and signed out of CC as previously noted.
* restart of LR CC2015 now shows me 28 days ! yay! but still goes away right after I click "Continue Trial"
In the end, I got on the chat with the Adobe Live Support just like karens79496233 suggested and as noted before, had me delete some lingering cache files
in C:\Program Files (x86)\Common Files\Adobe\SLCache and C:\ProgramData\Adobe\SLStore
And we are off and running !!

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