You have to choose version of the tool 32 or 64, then you have to choose the windows version Home, Pro (you can't choose both) and then the architecture where you can choose 32, 64 or both.
Admittedly I didn't try to install Pro on Home or vice verse because I didn't want to risk screwing up my upgrade, but I have one of each. And separate USB (and DVDs) I created for each -- Home and Pro.
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