OEM Key not Activated

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I downgrade Windows 10 to Windows 7 but OEM Windows 7 Home Premium key by Sony Corporation, enter product key is say Key is invalid. I checked specs page is Windows 7 Home Premium (Factory Windows) and installed same edition but Windows say I have 3 days to activate Windows, not 30 days to activate. I think I install wrong build. When I installing, Windows 7 is created windows.old (Old Windows 10) and still in drive and I have product key Windows 10 linked with Microsoft account so I think there have way to revert and use windows.old.Where I download Windows 7 .iso: Windows 7 SP1 Home Premium

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