Remove older versions of Windows PE add-ons before installing newer ADK versions.
The Windows Installer service caches .msi files in C:\Windows\Installer to perform maintenance, updates, and uninstalls without requiring the original media. If a user or a "disk cleanup" utility deletes these cached files, the installer will fail.
If you are using the Microsoft Deployment Toolkit (MDT) and see this error, it is often a known bug where the tool expects an x86 folder that the ADK no longer creates by default.
This comprehensive guide breaks down exactly why this error occurs and provides step-by-step troubleshooting methods to resolve it. Understanding the Root Cause setup cannot locate toolkit documentation-x86-en-us.msi
Security software often marks small, automated .msi downloads as suspicious, causing the web installer to time out.
Security software can mistakenly flag the download or execution of these background installers as suspicious activity, causing the setup to halt.
The error message is a common blocker that occurs when installing or updating the Microsoft Windows Assessment and Deployment Kit (ADK) or the Windows Software Development Kit (SDK) . This error usually triggers when the installer wrapper ( adksetup.exe or sdksetup.exe ) cannot access its localized 32-bit documentation payload. This problem commonly stems from network interruptions, aggressive corporate firewalls, outdated installer manifests, or Group Policy permission restrictions. Root Causes of the Error Remove older versions of Windows PE add-ons before
: Microsoft frequently updates these kits to fix installation bugs; ensure you are using the version specifically matched to your OS version (e.g., ADK for Windows 11 24H2). Install the Windows ADK offline - Microsoft Learn
If you cannot find the MSI anywhere, but you still have the original .exe installer:
If the steps above fail, your initial installer file might be corrupt. Delete your current adksetup.exe . If you are using the Microsoft Deployment Toolkit
If this error occurs within the modern Visual Studio Installer utility, the local download cache may be corrupted. Close all Visual Studio instances.
Open the extracted folder and look for a subfolder named Resources , Prerequisites , or Setup . Locate the file named toolkit documentation-x86-en-us.msi .
Users report this error most frequently in the following situations: