The Registration Code will be sent automatically to your PayPal email address when you purchase this plugin.
In the worst case this message should reach you after 15 minutes.

Please always check your SPAM folder!! Especially GMAIL tends to put messages containing long numbers there.

If the Registration Message didn't reach you after an hour:
1) please check if your PayPal email address is still valid.
2) check out if you really tried it with your PayPal email address
3) don't hesitate to contact kikzilla@ismism.de