This Key didn't work Please check it and try again, or try a different key (windows 7)

[castroWJ]

hello i have been receiving this error 'This Key didn't work Please check it and try again, or try a different key' i am on windows 7 ultimate i downloaded MediaCreationTool and that's were i received that error i bought a key and it gave me the error i went to YouTube and found nothing there i put my key (windows 7 ultimate) in and still no luck i want to upgrade to windows 10 (from 7) without losing any of pics or files

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