Once you decide to activate your installed OS, you will need to change the generic product key to the actual key you purchased.Many users have previously confirmed that if you have a product key for Windows 7, you can upgrade to Windows 10 and get a digital license for free. It's not possible to activate it unless you enter a genuine key purchased from Microsoft. Remember, these keys can only install Windows for evaluation or testing for a short time. Windows 8 Pro with Media Center: RR3BN-3YY9P-9D7FC-7J4YF-QGJXW.Windows 8 standard/non-Pro edition: FB4WR-32NVD-4RW79-XQFWH-CYQG3.The RTM release of Windows 8 was available in the following editions: Windows RT, Windows 8, Windows 8 Pro and Windows 8 Enterprise. Windows 8 Pro with Media Center: GBFNG-2X3TC-8R27F-RMKYB-JK7QT.Windows 8.1 Pro: XHQ8N-C3MCJ-RQXB6-WCHYG-C9WKB.Windows 8.1 standard/non-Pro edition: 334NH-RXG76-64THK-C7CKG-D3VPT.Here are generic keys for basic and Pro editions of Windows 8.1: Windows 8.1 has four different editions including Windows 8.1 RT, Windows 8.1, Windows 8.1 Pro and Windows 8.1 Enterprise. Windows 10 Enterprise: NPPR9-FWDCX-D2C8J-H872K-2YT43.Windows 10 Home Single Language 7HNRX-D7KGG-3K4RQ-4WPJ4-YTDFH.WIndows 10 Pro: VK7JG-NPHTM-C97JM-9MPGT-3V66T.

One is for the standard edition and the other is for the Enterprise edition. There are two generic keys available for Windows 10 at this moment. Generic key for Windows 8 Generic key for Windows 10

Windows 7 key for windows 10