I have installed, uninstalled and reinstalled LR CC 4 times. Also reinstalled the Desktop Application Manager 4 times. When I try to launch the app, the LR CC splash screen displays for ½ second and then disappears. Message screen informs me to reinstall the Application Manager. Everything appears to be normal until I try to launch LR again. And it all begins again.
Same happens to me, shows LR CC installed, but when I try to launch, the splash screen flashes and disappears.
I finally got it working. I THINK this is the procedure that worked for me.
1) Open Application Manager > Preferences > General > Sign Out.
2) Restart Computer
3) From Applications folder, relaunch Application Manager.
4) Sign In with Adobe ID
Hope this works for you. Evidently part of my problem was with the Application Manager itself.