From the Website:
The Download
Unfortunately, due to problems with hosting popular 3+GB files for download, I am no longer able to make the files available via direct download. They are available via BitTorrent (see YouTube videos) or you can contact me to purchase a DVD ($25)
If you'd like to support my efforts (I'm a poor starving student) feel free, but you are in no way obligated to do so.
I particularly like cash and geocoins.
I have used Ibycus Topo for a few years now -- first an earlier version on my Nuvi 255W and then v4.0 on the 450. I have been very pleased and would recommend it. Though it is not routable, the amount of detail makes it, IMHO, far more useful than Garmin's TopoCanada v 4 for caching and other siuations where you need more detail and information.
When I bought the 450, I wanted to update my version of Ibycus to v4.0. I sent the owner (Dale Atkin) funds for the DVD with a little extra and it arrived in ten days. No problems loading up.