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He didn't in-place Upgrade, he clean installed 7 Professional over Vista Home Premium.
Having any version of XP or Vista qualifies one for using Upgrade version.
The chart shows only in-place Upgrade paths Vista>7.
Since Vista was on a drive during install, a flag was passed allowing use of Upgrade version key so he can insert it at any time in the future without doing one of the workarounds.
Having any version of XP or Vista qualifies one for using Upgrade version.
The chart shows only in-place Upgrade paths Vista>7.
Since Vista was on a drive during install, a flag was passed allowing use of Upgrade version key so he can insert it at any time in the future without doing one of the workarounds.