Hello,
Sorry to hear you are having issues. Please visit your account product download page, you key should be listed in there. : https://store.stardock.com/myaccount/products. Do report back if you need further assistance.

Thank you, 
Basj,
Stardock Community Assistant.

Perhaps, its an account issue. Please raise support ticket using the link below, use the product not receive option. Include all information details. Remember to record down the ticket number for future reference if needed. Do not raise multiple ticket, that will make your ticket back to the end of the line. Send once and wait. Ticket will be answer by the order they send in.

https://stardock.atlassian.net/servicedesk/customer/portal/4/group/13 

Thanks
Basj,
Stardock Community Assistant