I installed CCS 5.1 and then clicked the Help-> Check for updates and proceeded to follow the dialogs to update CCS.
Once CCS was restarted, the whole re-installation process started. Some 40 minutes later it errors out with the message:
"One or more features were not installed correctly. Please look at the log .... for more information."
I looked at the log, and there is indeed more information. Can't say I know what to make of it though.