WD My Passport Windows 8 Upgrade

I want to do a “clean” install on my Vista OS so can I download the upgrade to my “passport” and then install to my “d drive” partion.My Vista OS is on " c drive" along with all my files etc.

Haven’t try this but don’t think is going to work

when downloading and update like this, it might want to try to install it to the external drive, hence, will not allow you to transfer the updated OS

also, not sure if it will let you to download the upgrade to another drive other than the source drive