Clicking on the Enter Registration Code button from the SoftShadow menu, will bring up the registration dialog:

 

If you have not yet purchased a registration code, click on Buy Now to purchase a registration code.

 

Once you have recieved your purchase confirmation email,  Enter or copy and paste the Name you used to register the software and the registration code sent to you via email and click OK to register your software.

 

If you have purchase a bundle, you will have one registration code for all pptXTREME products, however this code will need to be entered in the Enter Registration Code dialog manually for each product.