LR CC installed successfully. Launch, get upgrade catalog pop up, ok, Process. LR then launches then freezes at flash screen, Not Responding status. Have reinstalled, Signed out and back in etc etc. Have let it run for several hrs, no joy. Now have 9 catlogs from doign this 9 times. PS CC works fine.
I have found a solution somewhat. Not ideal, but working.
uninstalled and reinstalled for second time. Signed in to CC app, then signed out. Then opened LR CC, signed in from within that (not the CC app), the upgrade catalog pop up came up (again), then LR CC launched and worked fine, albeit bit sluggish.
signed out of LR, signed back in the CC app, lauch LR, it froze at splash screen. So tried LR5 whilst signed into CC app, it froze as well at splash screen.
SIgn out out if CC app, restart PC, launch LR5 without going through CC app, works fine. Tried LR CC direct, works fine. Tried again after sign in through CC app, froze.
so my issue appears related to the CC app.
after all this stuffing about, I am now up to catalog 13 !
so I have a solution for my problem, not ideal, but works.
two hrs in Adobe chat line did not proved the resolution.
Look at the FAQ section for LR6. There is a directory that needs to either have permission changes or just blown away. I just blew it away and was able to proceed.