Well, if you did something at Gamestop, why would you expect to find it at your Stardock account? Perhaps you bought a Stardock game at Gamestop? If so, perhaps you should look at your Gamestop account, or submitting a request for help to their customer support?
If you bought the game/software from Stardock, there should be some record of it in your account linked email (if you filter for 'Stardock' you might find it).
If that doesn't work, try submitting a ticket at https://esupport.stardock.com/
