To purchase a full licence follow this link:
http://www.2ndrock.com/purchase/purchase.html
Once payment is authorized your license key will be sent to the email address specified.
When you have your licence key press the ? icon in the top right of the application.
The following screen will be displayed. Copy and paste the licence details and press the Upgrade Software button.
Note. To check your licence click on the ? icon for details and the expiry date of product support.