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If you still see the error after following the above steps, here is a manual, advanced fix.

Click to download the local reference assemblies to your development machine. Troubleshooting Common Assembly Errors microsoftofficetoolscommonv90 download 2021

When a developer creates a VSTO add-in to add new features to Excel, Outlook, or Word, that add-in relies on this file to function correctly. So, if you're using a third-party Office extension, the presence of this file is a good sign it's built on a stable, Microsoft-supported foundation. If you still see the error after following

Instead, download and install the Visual Studio 2010 Tools for Office Runtime directly from the official Microsoft website. This 40 MB installer will safely and correctly place Microsoft.Office.Tools.Common.v9.0.dll on your system. By following this guide, you'll ensure your software runs correctly, avoid potential security risks, and keep your system stable. So, if you're using a third-party Office extension,

Most errors involving this specific naming scheme are resolved by updating the runtime environment that handles Office customization. Navigate to the official Microsoft Download Center. Search for (VSTO). Download and run the official executable installer.