well I'm one of the lucky ones to get it first. I was a beta tester when he first came out with the first screensaver. I'm also registered on their forum. So They send us an e-mail with a link to d/l the new version for free. I've had the MAT (marine aquarium time) for a little over a month now. Since I purchased the very first screensaver and Im a member of his forum we get all the updates and new versions for free.
I have all three screensavers. I have the aquarium (that's the one I purchased after beta testing it) then I got the Aquarium 2 (free) and then the MAT (free)