
You can fix this by changing the product key for the other computers where you installed a copy of Office. However, causing conflict if more copies are being installed at once. This error occurs because every Install button has been associated with a unique product key that can be used for only one install on one personal computer, thus preventing you from re-using it without paying for another copy of Office.



If you decide to purchase multiple copies of Microsoft Office 2016 or Microsoft Office 2019 and used the same Install button to install these copies of Office on multiple personal computers, the activation process will fail on all but one of these computers.
