How to Fix Windows 10 Activation Error 0xc03f6506

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Many home users often receive a computer with Windows 10 Home installed. And because Windows 10 Pro offers more features and utilities than Windows 10 Home, many users also prefer to upgrade their Windows 10 Home computer to Windows 10 Pro. However, a number of users have reported that they got error 0xc03f6506 and could not continue with the upgrade.

If you are one of these users, you will see the following error message on your screen when error 0xc03f6506 occurs:

“The last product key you entered can’t be used on this copy of Windows (0xc03f6506).”

This particular error usually occurs when you enable Windows 10, although it can also occur during the upgrade process. In this case, you will see the following error message:

“Unable to upgrade your edition, We can’t upgrade your edition of Windows. Try upgrading your edition of Windows again. (0xc03f6506).”

Using the Registry Editor

If you have upgraded to Windows 10 Pro and are having activation problems, you can use the Registry Editor to help you.

  • Press WINKEY + R to launch the Run utility, type regedit, and press Enter. With the Registry Editor open, navigate to the following key:
    • Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion
  • Now check if you find a DWORD with the name EditionID.
  • Double-click it and change its value data in Windows 10 Professional.
  • Also check if you find a password called ProductName.
  • Double-click it and change its value data in Windows 10 Professional.
  • Restart your computer for the changes to take effect.

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Activate Windows 10 via the Command Prompt

For this method, you need bootable media for Windows 10. If this is the case, insert the Windows 10 bootable media into the laptop or desktop computer.

  • Type cmd in Run. Then press Ctrl + Shift + Power to open the command prompt as the administrator.
  • Type the letter of the bootable drive in the command prompt window, for example, D:, and press Enter.
  • Then type this command:
    • setup.exe /auto upgrade /pkey xxxxx-xxxxx-xxxxx-xxxxx-xxxxx-xxxxx.
    • Replace xxxxx-xxxxx-xxxxx-xxxxx-xxxxx-xxxxx with your actual product key.
  • Press the Enter key on the keyboard to initiate this command.

Disabling the Network Adapter

Finally, you can also try to use the license key by deactivating your network adapter. In some cases, using license keys when you are not connected to the Internet can isolate many problems. Learn how to do this here:

  • Press the Windows + I key to open the settings.
  • Go to Network & Internet and click on “Change Adapter Options”.
  • Right click on your network adapter and click on “Disable”.
  • If you have deactivated the key, try again with the key.


So you can enable Windows 10 Pro when error 0xc03f6506 occurs. It is not absolutely necessary to enable Windows 10. However, it is preferable to activate the platform in order to take full advantage of all its options and features.

Please let us know what correction helped you resolve this activation error by leaving us a message in the “Comments” section below.

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