After purchasing anything at our online shop you're supposed to receive serial number(s), to be able to download product(s) you purchased you need to add/register it (them) at D16 User Area.
After then, please use Add license button in order to add license to your account
Paste the serial number you've received and click Add button
New license should appear in the list at the main page of your User Area If you purchased more than one product, repeat whole procedure serveral times, one time per each serial number you've received.