Much like countless others out there, I had the issue where the brand new Adobe Photoshop Lightroom CC would not start up at all after intalling it through the Adobe Creative Cloud! This was a very frusterating scenario. I could watch the process in Windows Explorere: I could see lightroom.exe load up briefly for a few seconds, then disappear without any notifications. Lightroom 5.7 continued to function perfectly, so for the time being I stuck with that until the solution was found. Luckly for you all, that solution HAS been found, and I'm here to share that with you right now!

The solution is this simple: sign out of your Adobe Creative Cloud account, and then sign back into it. When installing Lightroom CC through the Creative Cloud Manager, the application isn't properly registered to your Adobe account, and doing the sign out / sign in cycle forces the credentials to be reset for the application! You can use any other Creative Cloud application to sign out of your account, this includes Lightroom 5.x or Photoshop (pictured below)