- Open an elevated command prompt.
- Type the following command and hit the Enter key:
slmgr /ipk W269N-WFGWX-YVC9B-4J6C9-T83GX
Wait for the message box popup that the key is installed.
- Now type the following command and press Enter
slmgr /skms kms.xspace.in
Again, wait for the message box.
- Finally, enter the following command:
slmgr /ato
After you hit the Enter key, Windows 10 build 10240 will become activated.
You are done.
From Post http://winaero.com/blog/how-to-activate-windows-10-build-10240/