I downloaded the version of Lightroom CC for Mac and start the program makes an attempt to get the initial welcome screen and the program closes. Made several attempts and does the same. I uninstalled and reinstalled and behaves the same. Lightroom 5.0 is working properly and my system runs at 64 bits with 16 GB of RAM. Can anyone give me a solution. thanks
Could you try to logout - and in again from the Creative Cloud app.
Then relaunch Lr Desktop.
Hope this helps.