What Serial Code do I need for photokey8 registraton?

I am loading photokey8 on one more workstation. The current one is registered with an email that is not in use anymore so I registered with the new email but fxhome is asking for a serial code. What serial code is this that I need to add in as it doesn't excepts the PC serial code? There is no serial code available on the account page and nothing has been emailed.