On the registration page, click the 'Get it for free' button and the registration form will be displayed.
Enter your email address and click the 'Continue' button. and then choose the country in which you are located. Click the 'Continue' button.
Next, click the 'Complete Checkout' button and Your transaction has been completed successfully. They have emailed you details of your order.
Download, install it & launch the program
Use the activation code you have received to activate the PRO version.