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Before installing the VSTO Runtime, ensure your system meets these official Microsoft requirements Operating System:
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:
A 64-bit version of Microsoft Office requires the 64-bit (x64) VSTO Runtime. A 64-bit Office application cannot load a 32-bit (x86) add-in engine.
The bitness of the VSTO Runtime must match the bitness of the Microsoft Office installation, not necessarily the Windows operating system.
You may see this warning when PIAs are being installed. Ignore it—the runtime itself will work with newer Office versions. You can suppress the warning by using the /quiet flag.
This runtime supports solutions built for Office 2010, 2013, 2016, and newer versions. How to Install the Runtime
While the VSTO 2010 Runtime is an older technology, it remains necessary for several reasons:
Required for running customizations in Office 2010, 2013, 2016, and newer supported versions. How to Install the Runtime
The Microsoft Visual Studio 2010 Tools for Office Runtime -x64- can be deployed in the following ways:
Before installing the VSTO Runtime, ensure your system meets these official Microsoft requirements Operating System:
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:
A 64-bit version of Microsoft Office requires the 64-bit (x64) VSTO Runtime. A 64-bit Office application cannot load a 32-bit (x86) add-in engine.
The bitness of the VSTO Runtime must match the bitness of the Microsoft Office installation, not necessarily the Windows operating system.
You may see this warning when PIAs are being installed. Ignore it—the runtime itself will work with newer Office versions. You can suppress the warning by using the /quiet flag.
This runtime supports solutions built for Office 2010, 2013, 2016, and newer versions. How to Install the Runtime
While the VSTO 2010 Runtime is an older technology, it remains necessary for several reasons:
Required for running customizations in Office 2010, 2013, 2016, and newer supported versions. How to Install the Runtime
The Microsoft Visual Studio 2010 Tools for Office Runtime -x64- can be deployed in the following ways: