CHANGE PRODUCT KEY WINDOWS 10 or WINDOWS SERVER 2019 using CMD

 

1. Click Start and type CMD in the Start Search menu
2. Right Click and choose Run as administrator
3. To remove any existing product key (in case you used a trial key or a key that is no more valid), enter and run the command slmgr.vbs /upk .
4. Clear the product key from registry by running slmgr.vbs /cpky
5. To enter your new product key, use the command: slmgr.vbs /ipk xxxxx-xxxxx-xxxxx-xxxxx where the x’s are your new product key.
6. Lastly, activate Windows by entering the command slmgr.vbs /ato
7. Windows is now activated.

to check windows activation status type:

slmgr /xpr and hit enter

Just for me.