I recently downloaded Bryce 7 PLE and like it very much. How do I get Bryce 7 Pro version with all the new features, such as the Instancing Lab and whatnot?
Actually the Bryce PLE download is the same as the Bryce 7 Pro download. It is the serial number that unlocks the features that were not avalialbe in the PLE version.
However if you do go to the link that Ian has given you and redownload, you should find you have some additional files.
Do take note though that reinstalling Bryce does wipe out any presets etc that you may have added yourself when playing around with the PLE, so my advice is to not reinstall the main prgram file, just change the serial number, and only install any added content that come with the Bryce 7 Pro download.