Okay, now I get the problem. The FS is asking for an activation for Cloud9 Los Angeles,
This because you have a Serial Number for Cloud9 Los Angeles in the registry, but is not activated
however, I don't have any scenery installed, its only listed in the Addons Manager but not as active
As I've said, the installation status doesn't have anything to do with the activation. A scenery can be active but not installed, or installed but not active.
This is made so you are free to uninstall / reinstall a scenery as many times as you wish, without having to worry about losing its activation. It would be wrong if the registration was removed by simply uninstalling the scenery.
What can I do to delete this issue?
Just let it activate, even if you don't have the scenery installed, so it won't ask for it anymore.