Windows 10 Recover product key after deletion

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questionsformicrosoftproducts

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If you delete the product key what problems can you have upgrading Windows?

For example this computer had had Windows 7 (factory installed) and years ago was upgraded to Windows 10 free upgrade). Licenses should be on Microsoft servers. KMS was never used.

Running this command successfully removed the product key: slmgr.vbs /upk

How can it be restored?

Would a system restore have to be done?

Would it work?

slmgr /ipk does not display the product key.

slmgr /ato displayed product not found


ActiveSkuDescription : Windows(R) Operating System, RETAIL channel


OSVersion : 10.0.17763.2.00010100.0.0.048
ProductName : Windows 10 Pro
ProcessorArchitecture : x64
EditionId : Professional

What would happen with a failure to upgrade needing a clean install?

Is the product key no longer needed (license on Microsoft servers) with a Microsoft account and after the free upgrade to Windows 10?


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