If you upgraded to a version of Vegas Movie Studio Platinum (or Suite), you should have received the download link and serial number to Vegas DVD Architect as well. If the email with a serial number/key/code and confirmation was/is not in your spam folders either, read here.
To: vkmast, I am still in Limbo as I cannot access the serial no/codes, etc. I am not a PC nerd, just an amateur user and MAGIX does not have a record of my purchase, they gladly take your upgrade money and then dont have a cloud for customer service access!?
If you're writing here you also can go to the Magix site if you remember the email adres used to buy the software or upgrade. Go to the site of the next link and log in with that emailaddres: