The official way to obtain the file is through the Windows Assessment and Deployment Kit (ADK) download page on Microsoft Learn. This specific MSI is a component of the ADK used for offline help and documentation. Understanding the Documentation MSI

: Go to the Microsoft ADK install page and download the adksetup.exe for your version of Windows.

The toolkit documentation-x86_en-us.msi (or sometimes Toolkit20Documentation-x86_en-us.msi ) is a small installer package—typically around 300KiB—that contains the logic and data required to install offline help files for the ADK. It is commonly used by IT professionals for reference in air-gapped or low-connectivity environments where online documentation is unavailable. How to Download the Documentation File

Many users search for this download link because they encounter an error stating the setup cannot locate the file. This often happens due to: Download and install the Windows ADK | Microsoft Learn

: Choose a local folder. The installer will download all components, including the Installers subfolder where the .msi and .cab files are stored.