Vsto: Unable to install this application because the application with the same identity has been installed

The reason is the clickonce deployment method. The clickonce deployment mode can be online or offline. For details, refer:
Article:《 About the two modes and uninstallation of applications deployed by clickonce "
      As described in this article, cache exists in online mode. Therefore, clear the cache. The method is run: Mage
-CC . The problems in this article can also be solved. For more information, see :《 Clearing
The clickonce app Cache "
        Mage.exe is located at: \ Program
Files \ microsoft sdks \ windows \ v7.0a \ bin. For more information about mage, see Microsoft official documentation: http://msdn.microsoft.com/zh-cn/library/acz3y3te.aspx.
      For more information about deploying vsto to all users, see :《 Set
Deploy the vsto plug-in to all users .