1. Open command prompt with administrative rights. (Press win+X keys and then press A key from keyboard)
2. Now in command prompt, type slmgr /ipk W269N-WFGWX-YVC9B-4J6C9-T83GX and press enter. It will give you a popup that says that the key is installed.
3. Now type slmgr /skms kms.xspace.in and press enter and wait for the activation message box.
4. Now type slmgr /ato and it should activate your windows 10 copy.
If you are performing a clean installation on a machine that is reserved for free Windows 10 upgrade and you don't know the product key which was installed in your computer, you can use the generic keys provided by Microsoft to install windows 10. Using these keys is not illegal and these keys are genuine.
Windows 10 Home Key: TX9XD-98N7V-6WMQ6-BX7FG-H8Q99
Windows 10 Pro Key: VK7JG-NPHTM-C97JM-9MPGT-3V66T
Windows 10 Enterprise Key: NPPR9-FWDCX-D2C8J-H872K-2YT43
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