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We recently purchased the Windows 10 Upgrade offered by Microsoft. I asked Microsoft if there is a need for me to "prove" that I am using this purchase as an upgrade (by submitting the old Windows 7 key, for example). The support representative directed me back to TechSoup. I haven't figured out how to search within forums yet, so please forgive me if this has been asked and answered before. Thank you for your time!Nathan
you do not need to prove existing license. just make sure you have prove if you get audit.
you can't upgrade from any of HOME version using upgrade license. UPGRADE is only for PRO to 10 PRO or Enterprise only.
it won't stop you from install 10 pro version even you have exsitng home version. but you are not comply with license agreement.
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