1 - Select windows key for whichever version of windows you are running.
Home N: 3KHY7-WNT83-DGQKR-F7HPR-844BM
Home Single Language: 7HNRX-D7KGG-3K4RQ-4WPJ4-YTDFH
Home Country Specific: PVMJN-6DFY6-9CCP6-7BKTT-D3WVR
Professional N: MH37W-N47XK-V7XM9-C7227-GCQG9
Education N: 2WH4N-8QGBV-H22JP-CT43Q-MDWWJ
Enterprise N: DPH2V-TTNVB-4X9Q3-TJR4H-KHJW4
2 - Open Command Prompt as Administrator (type CMD into search, right click on command prompt and click “Run as Administrator”)
3 - Run the command “slmgr /ipk YOURKEYHERE” (use the key you selected from above, make sure it is for your correct version of windows). Wait a few seconds and if done correctly you will get a white box that pops up saying “Installed product key (YOURKEY) successfully”
5 - Run the command “slmgr /ato” wait a few seconds and you should see a white box pop up confirming windows was activated.
6 - Done! Enjoy activated windows for FREE with no more shitty watermarks!