SUS will download the whole one because microsoft made it so that it assumes the worst and that you have a computer that will require the whole thing or many computers that will all require diff parts...

you cannot get it at home because they pushed back the release date because IT professionals were not able to block it in time (due to the amount of apps it breaks MS decided to go with what the IT pro's requested)

if you need my sources i can post the e-mails that i got this from -- we have a subscription with MS here