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Sir, you need to have it registered before going for Windows 10 upgrade..
Once you register Windows 8, you can use Windows Upgrade assistant tool to upgrade Windows 8 to Windows 10.
You can get the upgrade assistant tool from below link
You will have option to copy to Flash Drive or Burn to disc format
You can choose the convenient way
Once you have Windows 10 image in hand. Do this to upgrade to Windows 10
1: Boot computer to Windows
2: Now insert disc or Flash drive which contains Windows 10 image
3: From My Computer > Open Disc / Flash drive and run the setup
Now follow the wizard for upgradation
I am glad to assist you if you have further query.
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