I could do with some help on this, since Steinberg are not responding to my support ticket.
I have owned a copy of Cubase 8.5 Artist (boxed version). I went through the Resale Wizard and was told to go to the MySteinberg page and delete the registration for the eLicenser.
Then it says that I can just sell the software on and the new owner can just re-register as if it is a new software.
The new owner had com back to me saying that the license is already in use.
I’m not really sure what I can do at this stage, since my account definitely shows no registered licenses.