Hey! So, if you purchased from, say, Plugin Boutique, our backend already 'knows' you purchased automatically, as we ask the vendors to let it know in real time. So all you need to do is be registered with the same email you register to PB with, and then go to 'My Orders'. Your purchase won't show up there, but you can always click 'Resend Licenses' to get the latest download or your serial number