that linked update does NOT include the DiVX support, it just includes the necessities for it (the license is still required). MS pays money for every optional media update downloaded, so they need to keep track of who has it and who doesnt. the only way to track it is via LIVE, so the update is only available through LIVE. there is no other way to get it, and the update is tied to the console so you cant get it from another console
one of the disadvantages of being banned