Dear csd,
I’m sorry, I gave the wrong info. The demo license for Dark Planet actually gets activated during the installation, but you need a Soft-eLicenser for that. Can you please check on your eLicenser Control Center if you have a Soft-eLicenser generated? If not, please check this article: https://www.steinberg.net/en/support/knowledgebase_new/show_details/kb_show/program-installation-does-not-create-a-soft-elicenser.html
Also you need the latest version of the eLC: http://www.elicenser.net/en/latest_downloads.html
After that, please run the Dark Planet installation (As Administrator) again.
Regards