LRCC, after downloading Upgrade from CeativeCloud icon. Splash screen flashes for a second and then is gone. Tried uninstalling with the uninstaller and installing again. Rebooted....same.
OSX10.10.3, 15" MBP-late2012
Try logging out of the CC app, then log back in again.
YES that is it!
LRCC starts, then LRCC upgrades your LR5 catalog.
Retrieving data ...