I can't seem to figure out how to download the CS50 appliance. When I click on the link http://mirror.cs50.net/appliance50/19/i386/appliance50-19-vmware.ova, a blank window appears. Could the link be broken? I was able to download and register VMWare Fusion so it is just the second part that is causing problems.
Try right click and save link as. Also, there's a torrent link here.