Adobe CC member. Downloaded new LR CC. Shows as installed in Adobe creative cloud. Wouldn't run at first, but logged out and back in. Now upon launch I get a dialogue box named Lightroom Catalog Upgrade, asking to click to upgrade my catalog, but this freezes with an unending blue circle and the program never launches. I have tried deleting and reloading the entire program. I still have LR 5 on my machine. Is this normal? I thought CC replaced 5. Help appreciated.