use your activity monitor to terminate it.
I have this same issue. Can't do updates - message says ccxprocess prevented update. I do not understand your suggestion "use your activity monitor to terminate it" How would I do that?
Hopefully, this will help you or other people experiencing the same problem. I woke my MBP today to find this issue.
1. Search for activity monitor using spotlight. I usually do this by hitting CMD+SPACE BAR then typing in whatever it is I need, in this case, "activity monitor"
2. Click on the "CPU" tab and search for ccxprocesses.
3. Hit the stop sign with an x in it.
4. Try to run updates again overnight. If you use adobe CC, maybe do this before you leave the office or go to bed so it won't do anything to your work.
*note I have only just done this, will post back tomorrow if it doesn't work.