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: The tool modifies specific registry keys ( EditionID and ProductName ) to trick the Windows installer into thinking you are performing an "upgrade" even though you are moving to a lower version.
If you are looking for a , you are likely trying to do one of two things: revert a modern Windows 10 or 11 system back to the classic OS, or switch between different editions of Windows 7 (like Professional to Home Premium) without a full reinstallation.
: It allows you to "downgrade" from Windows 7 Ultimate or Professional to Home Premium or Basic without losing your data.
