If you purchase a new or upgrade an existing Hauptwerk license, you will be contacted by MDA.
If purchase a sample set from MDA, likewise you need to wait until you are contacted by MDA.
If you purchase a sample set from another vendor,
it is up to the vendor to contact you regarding sending you the specific instructions regarding updating the license (dongle). At the same time that this information is sent to you, likewise the sample set vendor will send that information to MDA. Ultimately, it is MDA who will do the update procedure.
If you haven't received instructions from a vendor, you need to contact the vendor.
Further, you can contact MDA by filling out this form.
https://www.hauptwerk.com/forms/contact/.
This antiquated licensing procedure is going to be improved, basically automated. Until such times, the above is currently the procedure in place.
Rgds,
Ed