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  1. Go to Settings > System > Activation > Update product key > Change product key.
  2. Enter the 25-character code in the pop-up window. Alternatively, enter the key during the installation process.
  3. Now click on 'Next' to redeem it.


Your new operating system is now activated!


For other activation methods check here: https://support.microsoft.com/en-us/windows/activate-windows-c39005d4-95ee-b91e-b399-2820fda32227#WindowsVersion=Windows_11


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


  1. Select Start > Settings > System > Activation.
  2. Under Activate Windows Now section, select Activate by Phone.
  3. Select your country in the drop-down menu and follow the on-screen instructions
  4. Call the toll-free number and follow the instructions to activate your Windows


If you are having any issues with the first two steps, you could also try the following:


  1. Open "Run" window (can also be found under "Start")
  2. Type in "SLUI 04" and follow with Enter.


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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