When I downloaded the student upgrade version last week, it was a pain in the ass. You had to download three files from a proprietary download manager, and then run a program to expand those into an image. The thing is, the expansion program would throw an error when it was finished, leading you to believe that it didn't work. On top of that, what it expanded was the file structure of the DVD, not a burnable ISO. It was a pain to get started, but I found some guides and got it to work.
Thankfully, they've fixed it, and you can
directly download the ISO now.
__________________
Main Rig: ASRock 939Dual-SATA2, Opteron 165 @ 9x275=2475, 7600 GT
Laptop: Dell 1520, C2D @ 2000, 8600M GT
Icrontic_11: Asus A7N8X-Deluxe, Barton @ 13x170=2210