Always match your ADK version to the version of Windows you are deploying, not necessarily the version of the OS currently running on your technician PC. Download and install the Windows ADK | Microsoft Learn
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 adk toolkit documentationx86enusmsi download link