You’ll be sent a mail with the license file attached promptly after your paiement.
Save that file on your computer. Click the ‘register’ button in the plugin window and then the ‘import license key…’ button.
Browse to the license file, select it and click ‘ok’.
If you do not receive a license key within a few minutes of your purchase, please contact us.
Be sure that email from firstname.lastname@example.org is not going into your spam folder.