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Need to downgrade from Professional to Home Premium without the DVD
I have bought a second hand computer and the seller has done a fresh install of Windows but he has installed Professional and the license key on the laptop is for Home Premium. The installed version does not accept it and I have no other key (contacting the seller for something is not possible). I use none of the features that make the difference between the versions so I want to downgrade the system. The problem is, I don't have the DVD and all trustworthy download sites for it that I found are offline. The two methods I found for downgrade (simple new install as well as changing the version in the registry and "repairing") need the DVD.
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