Impossible to know
What Update are you trying?
It appears many of us are having this issue. Solutions vary as it appears different things work for different people. At the moment I am left with the unfortunate possibility of uninstalling the entire Creative Cloud and then running the CC Cleaner Tool to fix this one issue. Have you tried any of the suggested solutions?
Though it could be that Adobe will fix all these issues with their upcoming release of Creative Cloud next week Wednesday.
Can you please let us know the error that you are getting at your end.
This will help us in suggesting a suitable solution to your problem.
I am not quite sure why you have marked this as the correct answer. Despite that it appears Pandorica has found a possible solution to the problem:
It has worked for most people.