How to fix 0xC004C020 activation error on Windows 10?

Error 0xC004C020 increases if the entered license key is detected by the server as already being used on another PC. This happens quite rarely.

To solve the problem, do the following:

• If you have already specified this 25-digit cipher on another device, deactivate it from the command line or use the new Windows license.
• If you suspect that someone else has used the code, inform the seller of your product. It should automatically adjust the issue.

To deactivate the key, open a search on your computer and type cmd. This opens the command line interface. Type the slmgr /upk command into it and click OK.

Activate the windows again!

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