Using the aforementioned method you can activate any mainstream version of Windows 10 like Windows 10 Home, Windows 10 Home Single Language, Windows 10 Professional, etc. STEP 5: Lastly, enter the command slmgr /atoand hit enter to activate Windows 10 for free with CMD. STEP 4: The next command you have to type is slmgr /skms zh.us.to and as usual hit enter after typing the command. Kindly replace the Windows 10 Activation Key with the actual Windows 10 Activation Key that you can access, which can be acquired from third-party sellers. STEP 3: Copy and paste the next command, slmgr /ipk, and once again hit enter to execute the command.