This update is no longer available. To fix the issues that are described in this article, install the latest Microsoft Office update from the following Microsoft Docs article:
Microsoft has released an update for Microsoft Office 2013. This update provides the latest fixes for the 32-bit and 64-bit editions of Office 2013. Additionally, this update contains stability and performance improvements.
Issues that this update fixes
Add-ins that are built by using Microsoft Visual Studio 2005 Tools for Microsoft Office System (VSTO 2005) or VSTO 3.0 do not work in Office 2013.