Bought Windows 7 Family Pack, where can I download the iso?

Bought Windows 7 Family Pack, where can I download the iso?

I just asked my brother, who's in the US to buy me a copy of Windows 7 Home Premium Family pack. It's gonna take a while to mail the package to me here in Hong Kong. So, I just asked him to email the key to me. Is there any way to download the DVD ISO somewhere? I heard pre-orders online can get it this way. Will I be able to download the ISO as well?