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License Error Upgrade from Windows 8 Home Edition to Windows 8.1 Pro

Dear Experts,

I upgraded my computer from Windows 8 Home Edition to Windows 8.1 Pro Edition. After upgrade, I entered the new Windows 8.1 Pro Ed. License Key and it did not accept as given below attachment. What can I do for this?

Best Regards
2 Solutions
You might wanna try this one.

Reference link:

Hi The Kray,
The error 0xC004C008 means that the key has exceeded the activation limit and the activation server determined that the specified product key could not be used.
If you have trouble activating Windows 7 open the Windows Activation Wizard while in Windows 7 to use the phone and activate Windows:  
1. When you reach the desktop click Start, then in the Search box type:  slui.exe 4  
2. Press Enter on your Keyboard  
3. Select your Country.  
4. Select the Phone Activation option, then call the number given .
You may have to call PA Call Center to activate the system.
Microsoft Activation Centers Worldwide Telephone Numbers

For more information, please refer to the article below.
How to troubleshoot Volume Activation error codes on Windows 7, Windows Server 2008 and Windows Vista-based computers

You may also try the steps suugested by TrekDozer on Thursday, December 03, 2009 12:43 AM.
Hope this helps.
You are not using the correct way to change the Edition. The correct one is described here: http://windows.microsoft.com/en-us/windows-8/feature-packs

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