Windows 11 Activation Error code: 0xC004C003

  • Thread starter Thread starter Lubomir Mitana
  • Start date Start date
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Lubomir Mitana

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I purchased a machine with pre-installed Windows 10 Pro (OEM). I was forced to upgrade to Windows 11 Pro. I swapped a SSD with a bigger one and installed Windows 11. Now it says I do not have a valid licence.

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