A couple of weeks ago I wrote a post about doing a Cloud Control 12cR5 installation and said I would be testing the upgrade from 12cR4. I’ve now done that.
The upgrade documentation is quite extensive and the prerequisites are going to be different depending on the database and cloud control versions you are starting with, so this is no way a “recommended” way to do the upgrade. Each one will need to be approached on a case-by-case basis. It’s just meant to give a flavour of what you have to do.
Suffice to say, it worked fine for me. 🙂