BlurredD they do that because the build released on there site is the "Network Install", what a network install is everything in one, so you dont need a internet connection to install.

They want home users to run the small 1mb odd file, which finds out what you need, and only downloads what you need. (Which saves them bandwidth)

Personally I always download the network install, burn it to CD, so I can give it to friends to update who are on dialup.

Its up to you, its a 260mb download for the Network Install, the differences are nothing, its just a big download, but in this day and age with broadband, it shouldnt be a problem for a lot of us.