And if you go Pinnacle's FAQ, and search you will read this....
Where is the serial number for the product that I downloaded?
We present the serial number twice for your convenience.
(1) When you purchased the product, we displayed the serial number on the download confirmation page.
(2) We also send the serial number to your email
address as part of the order confirmation so look in your email inbox
on the date you purchased the product. If you have a spam filter, check
that to see if it prevented it from being delivered to your inbox.