I'm attempting to download both the Sitefinity for .NET 3.5 and 2.0 and neither one is a valid win32 file. In addition they take seconds to download and are under 5K each, not 92 meg.
Edited to add:
It's embarrassing to admit that this may be my laptop's issue. I'm running Snow Leopard on a Macbook Pro with Parallels and Windows 7. It turns out that the combination of Norton Internet Security for mac, Parallels and OSX, breaks the ability to download .exe files.
Leaving this here on the off chance that someone else encounters the same exact problem.