The "Loader" component that manages add-in security and deployment. Compatibility with Windows 7 through Windows 11.
Understanding the Visual Studio 2010 Tools for Office Runtime 64-bit Download
If your Office is 64-bit, you specifically need the 64-bit VSTO runtime components. visual studio 2010 tools for office runtime 64 bit download
The VSTO 2010 Runtime includes several layers that make Office automation possible: Office Extensions for the .NET Framework 4 (or higher).
The Visual Studio 2010 Tools for Office Runtime (VSTO) is a critical component for running Microsoft Office solutions built using Visual Studio. Even years after its release, it remains a necessity for users and developers who rely on legacy Office customizations and business-specific add-ins. The "Loader" component that manages add-in security and
Ensure the "LoadBehavior" in the Windows Registry is set to "3" (Load at Startup).
Most modern systems running Microsoft 365 or Office 2019/2021 default to 64-bit. Key Features and Requirements The VSTO 2010 Runtime includes several layers that
Check your Office bitness by going to File > Account > About Word/Excel.
Check if Office is blocking add-ins under File > Options > Trust Center > Trust Center Settings > Add-ins.