Office 2007 has been designed to have the Vista look, but it doesn't need to run in Vista - it will run quite happily in Windows XP.
I can't answer your download question I'm afraid. I get the technical refresh via a different Microsoft download source because I'm on the Office beta technical panel, but I know that many people have received the same email as you, and have downloaded without any problems. Have you got the Microsoft Genuine Advantage tool installed on your machine? You won't be able to proceed with the download unless you have.
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