Step 1: Select the right key for your Windows.

Step 2: Right-click on the start button and open Command Prompt (Admin).

Step 3: Use the command “slmgr /ipk yourlicensekey” to install a license key (yourlicensekey is the activation key you got above).

(*Note*: You need to hit [Enter] key to execute commands.)

Step 4: Use the command “slmgr /skms kms8.msguides.com” to connect to my KMS server.
Step 5: The last step is to activate your Windows using the command “slmgr /ato”.