Since the connection between the app tiles on the desktop and the store may not be up to date, the installation may not be successful.
While Windows has an built-in system task to automatically update the Microsoft Store app, Office may be launched before the automated update process begins. The first step when working with any Universal Windows Platform (UWP) application is to update the Windows Store. This is working within the design specification for the current Microsoft Office 2016 individual system license installation process.
