Microsoft Office 2021 does NOT use the v90 common tools. Office 2021 is built on Visual Studio 2019/2022 runtimes (v142/v143).
Put simply, if you have a legacy application, a custom business tool, or an older Office add-in that hasn't been updated in years, it might rely on this specific VSTO runtime to work.
is not a standalone application you download by itself. Instead, it's a core software component—specifically a Dynamic Link Library (DLL) file —that is part of a larger framework known as the Visual Studio Tools for Office (VSTO) Runtime .
You can access basic tools entirely for free via Microsoft 365 on the Web . microsoftofficetoolscommonv90 download 2021
If you are trying to install and you see an error about microsoftofficetoolscommonv90 , something is wrong with your installer. You may have accidentally downloaded an Office 2021 skin or theme that is trying to call legacy code. In this case:
<Configuration> <Add OfficeClientEdition="64" Channel="PerpetualVL2021"> <Product ID="ProPlus2021Volume" PIDKEY="YOUR-KEY-HERE"> <Language ID="en-us" /> </Product> </Add> </Configuration>
Since v90 = Visual Studio 2008, you need the . Microsoft Office 2021 does NOT use the v90 common tools
After the restart, the application or add-in that was giving you the error should now work correctly, as the missing component is now present on your system.
Run the installer as an Administrator and follow the prompts. 2. Enable .NET Framework 3.5 (Includes v9.0 Components)
Microsoft has made the VSTO runtime available on its official Download Center. is not a standalone application you download by itself
Method 3: Use the Windows Program Install and Uninstall Troubleshooter
Search for and download the . Select the version matching your system architecture: x86 for 32-bit operating systems/applications. x64 for 64-bit operating systems/applications.
: In Microsoft naming conventions, "v90" or "9.0" signifies Visual Studio 2008 and the .NET Framework 3.5 era.
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