When Elsie is run, it normally operates in the Student mode. If it finds the key, it automatically upgrades itself up to the full Professional mode with no effort on the part of the user.
To purchase the key to upgrade from the Student mode up to the Professional mode, click on the Buy Now button below.
The price of the key is only US$195.
(Clicking on that button takes you to PayPal's secure transaction site)
The key is a small file to be copied from a return e-mail into the folder/directory where Elsie is located. The e-mail reply is a manual operation, not automated, and is normally done during Eastern Time U.S.A. business hours.