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"Change product key" link is not available in Windows 8 or in Windows Server 2012
Article ID: 2750773 - View products that this article applies to.
When you try to change the product key in Windows 8 or in Windows Server 2012, you cannot find a "Change product key" link in the System item in Control Panel.
For example, you want to convert a default setup product key to a Multiple Activation Key (MAK) on a computer that is running Windows 8. However, you cannot find an element in the UI that lets you change the product key.
This issue occurs because the "Change product key" link is not displayed if Windows 8 or Windows 2012 is not activated.
To change the product key without first activating Windows, use one of the following methods:
Method 2Run the following command at an elevated command prompt:
Cscript.exe %windir%\system32\slmgr.vbs /ipk <Your product key>Note You can also use the Volume Activation Management Tool (VAMT) 3.0 to change the product key remotely, or if you want to change the product key on multiple computers.
In Windows 7, a "Change product key" link is displayed when Windows is not activated.