Microsoft Visual Studio 2010 Tools For Office Runtime -x64- ((free)) → < Certified >

In many cases, the VSTO Runtime is installed automatically when you install Visual Studio or Microsoft Office. However, if you are a user trying to run a specific add-in and encounter an error, you may need to install it manually:

If you are running a 64-bit version of Microsoft Office on a 64-bit Windows OS, you must have the x64 VSTO Runtime installed. microsoft visual studio 2010 tools for office runtime -x64-

Conversely, if you have 32-bit Office installed on a 64-bit Windows system, you would actually need the x86 version of the runtime. System Requirements and Prerequisites In many cases, the VSTO Runtime is installed

The bitness of the VSTO Runtime must match the bitness of the Microsoft Office installation, not necessarily the Windows operating system. In many cases