Immediately realised I'd paid for it with the wrong PayPal account - doh.
I didn't register my site or download the software so I submitted a ticket asking for that purchase to be refunded so I could purchase a new licence.
The licence I bought has been removed from my account, no sign of a refund though. I can't view my support ticket now because I "must have at least one up-to-date license to access this page".
Not really sure what to do. Happy to purchase the licence from the correct PayPal account first as long as I can get my original licence cost back.