I had installed - and removed (using Windows control panel) - XE 18c. Now I want to install XE 11g. I keep getting the error "Installer has detected an already existing XE instance on this system. Installation cannot proceed."
As I said, I uninstalled the previous XE using Windows, the I went through and removed all Oracle folders, any reference to Oracle in the environment variables, any trace of Oracle I could find in the registry (I checked several online articles to figure out what to delete), and all Oracle services. I don't see any trace of Oracle on my system, yet the installer apparently does.
Any ideas?