Office 2013: C:\Program Files\Microsoft Office\Office15 or C:\Program Files (x86)\Microsoft Office\Office15.Office 2016 / 2019: C:\Program Files\Microsoft Office\Office16 or C:\Program Files (x86)\Microsoft Office\Office16.The subfolder varies depending on your Office version: Navigate to the Microsoft Office program folder using the cd command. To get started, open the Command Prompt as administrator. How to update / replace Office license key before the expiration date? Is there a way to change the product key without reinstalling Office suite? Do you have an old PC you want to sell, but also want to transfer your Office license to your new PC? In this tutorial we’ll show you an easy way to remove the existing product key registered with your Microsoft Office 2019 / 2016 / 2013 application.