Hi Jim,
please create a service request for the serial no. at vstabi.info/devices and we will find a solution from there, about the unit and about the license.
If still possible, downgrade the unit to Express in advance, to free the license, then you also know the serial no.
If not, pinpoint the serial no. by method of elimination, bind to the existing models, find the one which is missing.
Best,
Eddi
Born to fly ...
forced to work.