i’m one of the developers of the CityEditor and just stumbled across this thread and thought i could contribute some useful information for people who want to try out our extension:
It is indeed true that the CityEditor cannot be used right after the installation. You first have to request a license using the integrated request mechanism. Although a license has to be purchased eventually to keep using the CityEditor forever, first time user’s will receive a free, time-limited evaluation license granting full access to the CityEditor’s features.
After you’ve installed the CityEditor extension a dialog titled ‘First Steps’ should pop up explaining how to request a license. All of this is of course also documented in the user’s manual that can be downloaded from the CityEditor’s extension warehouse page.
Just give it a try! It really only takes seconds to request a license!