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Recover product key after deletion


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Guest 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® 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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