After you have installed Windows on your computer, the unit needs activation. Only activated Windows 10 will have all of the features of the OS. But while activating there can be various kinds of errors. One particular error may be the activation error 0xc03f6506 can come for few users who are trying to upgrade to Windows 10 Pro from home or any other editions. The error message you receive in such a condition is, The final product key you entered can't be used about this copy of Windows (0xc03f6506). So how to fix this activation error, let's discover.

There are multiple ways you can fix this error in Windows 10 while activating the OS.

How you can Fix Windows Activation Error 0xc03f6506

You will find different methods you can test to repair Windows activation error 0xc03f6506. One of them would be to activate via command prompt, let's see results for yourself.

Activate Windows 10 through the Command Prompt:

Step 1: In order to activate via command prompt, you will need a bootable Windows 10 installation CD. It can be a pen drive as well.

Step 2: Open the command prompt within the administrator prompt. To get this done type cmd in the start menu and in the result, right-click on the command prompt within the google listing and choose Open as Administrator.

Step 3: This will open the command prompt in administrator mode.

Step 4: Now insert the bootable media for Windows 10.

Step five: You now have to type this in the command prompt setup.exe /auto upgrade /pkey xxxxx-xxxxx-xxxxx-xxxxx-xxxxx. Here xxxxx-xxxxx-xxxxx-xxxxx-xxxxx may be the actual product key which you need to enter properly.

Now Windows will activate your copy.

Disable Network Connection:

If you are not capable of finding a strategy to this problem, you can try this method of disabling the network connection.

Step 1: Open the run command in Windows (Win key + R)

Step 2: Type ncpa.cpl in the run command and press enter button.

Step 3: This can open the Network connection inside your Windows.

Step 4: In the next step, right-click your web connection there and select Disable.

Step five: Now try activating your PC while using Windows key. Once activation is performed, be sure you enable the network connection once again.