Download and install the application and you will find your registration / serial number inside the downloaded zip file as a TEXT file ( your registration number is.txt) .
Use The PAYPAL e-mail address when you register the app. and it prompt for a e-mail address.
Note: Silent Anti Piracy System: Only 2 installs per year (356 days) calculated from date of purchase per single purchase or the software will give incorrect results even if it seem to be fully registered. More Info...