Bryce 5 will be out in the Spring. Hold off until we get word whether or not B5 is worth it -- then you'll probably want to buy that instead. To my knowledge, the Corel Bryce 4 upgrade was only available as a limited-time offer to previously registered Bryce 3D owners, about 2 years ago. Once that limited time expired, everyone had to purchase a full version of Bryce 4 to get it. The only difference between the two was that the upgrade didn't come in a box, just cellophane-wrapped.