I suspect that when PG Music builds up the external audiophile drives for their customers, they install the stereo demo files as part of the task.(In my case, they had a TeraByte to work with - so might as well put the "accessory" files on it)

Later, when the audiophile customer buys an upgrade, it looks like the upgrade disks may contain only the executable program updates and the specified new RealTracks, but very little of the "Gingerbread" that came with the orignal audiophile build-up.

As I look at the PG Music web site I can see no "Button" to go to "My Account".
If I could get to "My Account" I might get annother peek at those big download files that were offered on the day I paid for the software.