I have windows 7. If that qualifies me for a free upgrade, would I be able to receive an ISO of the windows 10 upgrade? I don't care to actually install it bu

I have windows 7. If that qualifies me for a free upgrade, would I be able to receive an ISO of the windows 10 upgrade? I don't care to actually install it but I would like to archive it on my server so I could install it later, say for bug regression. Can I request a DVD or is the install only available online?