Hi, I started a trial of Lightroom 5 yesterday and everything ran fine, late last night I was informed there was a product update to download.
As soon as Lightroom CC launches it displays the trial dialogue (days remaining box) once you click continue Lightroom CC closes.
I have tried re-installing, rebooting and signing in and out of Creative Cloud - all to no avail.
Same problem on Dell Latitude with Windows 7x64.
Lightroom does not start at all (or crashed immediately).