This method that helps you to activate Windows without product key easily.
This Way supported By msguides.com
Step 1: You select the right key for the Windows edition you use.
Click here to find Here the list of all Windows Keys
Step 2: You right-click on the start button and open Command Prompt (Run as Administrator)
Step 3: You use the command “slmgr.vbs /ipk yourlicensekey” to install a license key (yourlicensekey is the activation key you got at step 1).
For example, my Windows 10 is Windows 10 Pro. So I type:
slmgr.vbs /ipk W269N-WFGWX-YVC9B-4J6C9-T83GX
(*Note*: You need to hit [Enter] key to execute commands.)
Step 4: You use the command “slmgr.vbs /skms s8.uk.to” to connect to my KMS server.
NOTICE : Check the online server Online list From Here
Step 5: The last step you use the command “slmgr.vbs /ato”.
You check the activation status again.