How to find your registration code
First, you must download and install WinSU. If you have not done this yet, go here
Once you have installed the software, evaluated it, and you have decided that you wish to purchase please click 'Register this software' under the Help menu on the main WinSU window, as shown in the example below.
A four digit number will be shown (example circled in green below, your own code will be different!). Go to the Registration payment web page here and complete your payment stating your personal four digit code.