The "Buy Professional Edition" button takes you to Paypal, which you
can use with a credit card even if you do not have an account there.
On receipt of payment, Paypal sends us a receipt, which triggers the
preparation of your personal copy of the Professional edition. (Your
name is entered in the Description field of the PDF.) This PDF is then sent to the email
address you entered in the purchase dialogue with Paypal.
The process is not fully automatic yet, so your copy can take a few
hours to arrive. If you do not receive it within 1 working day of
payment, let me know.
Future editions will be sent automatically to this same email