sometimes the "opm.db file" is the culprit. In this case you should delete it.
But as much as I regret it and as strange as it may seem I fear it's a challenge for Adobe's Creative Cloud Cleaner Tool.
Sometimes - for whatever reasons - CC doesn't "want" to work. In this case you should CC completely delete and reinstall by help of Adobe Creative Cloud Cleaner Tool. (A try to uninstall by own resources is not enough!)
I quote: ... helps resolve installation problems for Adobe Creative Cloud and Adobe Creative Suite (CS3-CS6) applications. The tool removes installation records for prerelease installations of Creative Cloud or Creative Suite applications. It does not affect existing installations of previous versions of Creative Cloud or Creative Suite applications.
Please use: http://helpx.adobe.com/creative-suite/kb/cs5-cleaner-tool-installation-problems.html and follow the prescribed sequence of operations
Thanks for that.
I have used the cleaner tool and tried to reinstall Creative Cloud.
Now I have this error
We've encountered the following issues:
Another version of Creative Cloud desktop is currently running.
To continue, please quit that instance and click retry (Error code: 86)
Please try to get the chat now, as I said above:
http://helpx.adobe.com/contact.html >>> Adobe InDesign >>> Select a topic... >>> Downloading, installing, and setting up >>> Troubleshooting >>> Still need help? Contact us. >>> Click >>> Use Chat if "open" (see screenshot)