Setup Cannot Locate Toolkit Documentation-x86-en-us.msi May 2026

The error "Setup cannot locate toolkit documentation-x86-en-us.msi" typically occurs when installing the Windows Assessment and Deployment Kit (ADK). This happens because the installer cannot find a specific component, often due to an incomplete download, restricted folder permissions, or attempting an offline installation without all required files.  1. Perform an Offline Download (Most Reliable) 

, the lead systems administrator, sat hunched over his workstation. The blue glow of the monitor reflected in his tired eyes as he attempted, for the third time that night, to install the Windows Assessment and Deployment Kit (ADK) setup cannot locate toolkit documentation-x86-en-us.msi

Reference Counting Corruption: A previous installation or uninstall left a stale registry key in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData. The system believes a required feature (the documentation) is already present, but the source path points to a temp folder that was cleaned up months ago. Press Win + R , type regedit , and press Enter

to ensure the installer has the authority to create and modify necessary directories. Check Version Compatibility Press Win + R

1. Download the Microsoft Program Install and Uninstall Troubleshooter from the Microsoft Support website.
2. Run the utility.
3. Select "Uninstalling" when asked "Are you having problems installing or uninstalling a program?"
4. Select the program associated with the toolkit (or the generic "Toolkit Documentation" if listed) from the list.
5. Select "Yes, try uninstall".

   files began to fill a local folder. When the download finally finished, Arthur ran the adksetup.exe

   1. Press Win + R, type regedit, and press Enter.
   2. Navigate to: HKEY_CLASSES_ROOT\Installer\Products
   3. This folder contains GUIDs (long strings of characters). This is tedious, so instead, search for the file name:

      . This specific .msi file is a component of the Windows Assessment Toolkit used to evaluate operating system quality and performance. Common Causes Network and Security Interference

      "Download the Windows Assessment and Deployment Kit for installation on a separate computer"