This happens because each Install button is associated with a unique product key that can only be installed on one PC. If you bought multiple copies of Office and used the same Install button to install Office on multiple PCs, activation fails on the other PCs. Best practice for multiple versions of Office
Select your Office version from the tabs below. How you change the product key depends on your version of Office.
This article applies to Office Home & Business, Office Professional, and individually purchased Office apps. To switch an Office install to or from Microsoft 365, see Switch your Office license.
#Install new office 2016 with key code for mac
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