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VSTO: Unable to install this application because an application with the same identity is already installed...

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  1. Open the command window (Window Key + R) and then type “cmd” and return

  1. Type “rundll32 dfshim CleanOnlineAppCache” in the command window
rundll32 dfshim CleanOnlineAppCache

References:
https://stackoverflow.com/questions/1544210/installing-office-customization
https://code.msdn.microsoft.com/Excel-2010-Favorites-Ribbon-7dc841b8