When you purchase Pro, the sales support team send you an email with a link to your personal download page. Check your email.

Bookmark your personal download page when you get it.
A little more information in post 2 & 3 here:
Upgrading to V 4.18 (click on link), so it shows where your download link is also found on your receipt.
BTW creating a new thread topic would have been the way to go.