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  1. Select the Start button, and then select Settings > Update & Security > Activation.
  2. Select ‘Change product key’.
  3. Type in the product key and follow the instructions.


For other activation methods, open this link - https://support.microsoft.com/en-us/windows/activate-windows-10-c39005d4-95ee-b91e-b399-2820fda32227


If your error shows as 0xC004C008, please also try the following method:



  1. Click on Start and select Settings > Update & Security > Activation.
  2. Select Activate Windows Now section, and then Activate by Phone.
  3. Select your location (or the location nearest to you) from the drop-down list, and then click Next.
  4. Call one of the available phone numbers listed. An automated system will guide you through the activation process.
  5. If you're not able to complete activation successfully, you will be connected to Microsoft support for your region and country.


If you are having any issues with the first two steps, you can also try the following to start the phone activation by a system command:



  1. Open Run window (also can be found under "Start").
  2. Type in SLUI 04 and follow with Enter.
  3. The rest of the steps should be the same as above.


Make sure that you are trying to redeem the code on the same version of the OS, mismatch between Home/Professional/etc. versions may cause additional issues.

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