Just to make sure you have registered the program correctly:
To register:
1- Open the program.
2- From the top left corner, click the "File" menu.
3- From the dropdown menu select "Register software..."
4- Enter your registration code (numbers-letters) and click on Register.
5-If successful, you'll see the "Licensed Software" status at the very top of the window, next to the program's name.
If you still have issues, you may need to submit a support ticket using this link: https://www.nch.com.au/support/