J
Joey D&C
We have several units of laptops with Windows 10 Home Single Language.Recently, we purchased Windows 10 Pro (DVD OS) for an upgrade. We followed several procedures on the web and input the Product Key (on the DVD) but all of the keys were invalid.These are genuine Win 10 Pro and were bought from an official Microsoft reseller.The error message was "the product key you entered didn't work. Error 0xc004f050". Can anyone help with this?BTW, the laptop reseller mentioned that regular upgrades (via Windows settings) cannot be done and advised to do a full fresh (reformat) install of the Win 10 Pro.
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