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Can I upgrade Windows 8 on a trial version of a previous Windows release? Or does the previous release have to be "verified?"

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up vote 4 down vote accepted

No, the upgrade version will not work with a trial version of any previous Windows OS.

As per the Windows 8 Upgrade terms and conditions, you need a valid base license for Windows XP, Vista, or 7 in order to use an upgrade copy of Windows 8.

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