I bought Vista Ultimate professional to upgrade the installed Vista. The 'Upgrade' feature is disabled in my professional (full) Vista Ultimate package. Why?

Why can't go from Vista Home Premium to Vista Ultimate?

I have a laptop double boot configured with Vista Home Premium and Windows 7 Professional.

I bought Vista Ultimate professional to upgrade the installed Vista. The 'Upgrade' feature is disabled in my professional (full) Vista Ultimate package. Why?

Update requires the same Service Pack level.  For example, if your current Windows Vista Home Premium SP1 or SP2 installed, you will need to uninstall the Service Pack to be able to use the Windows Vista Ultimate Edition disc, you have that has no Service Pack integrated.

See: How to uninstall Windows Vista service packs as a troubleshooting step

Tags: Windows

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