That's one download because it's a 'critical update', and another download to get a second copy of the installer to actually complete the installation when you realise the first one is broken.
Seriously, the number of borked IE installations I've seen recently is stupid. Perhaps they should measure satisfied customers instead?
I've actually increased the number of Firefox users thanks to IE7 - it was the quickest way to get the laptop back on the net to get the newer build of IE7.