Setup Cannot Locate Toolkit Documentation-x86-en-us.msi 〈Full 2026〉

If you are performing an offline installation, the error indicates that the Installers subfolder is missing the specific toolkit documentation-x86-en-us.msi package.

: If you are deploying Windows 11, note that some versions of the ADK require a separate WinPE Add-on download. Additionally, the "Assessment Toolkit" might be listed but unavailable in certain releases. setup cannot locate toolkit documentation-x86-en-us.msi

: In newer versions of the ADK (such as for Windows 11), the 32-bit (x86) version of WinPE and certain toolkits has been removed. If your setup is failing on an x86-specific MSI, check the official Microsoft ADK documentation to see if that component is still supported for your target version. If you are performing an offline installation, the

The error commonly occurs during the installation of the Windows Assessment and Deployment Kit (ADK) . This typically happens because of corrupted download files, lack of internet access during an "online" installation attempt, or restricted folder permissions. Solutions to Fix the MSI Error : In newer versions of the ADK (such

: Copy the entire contents of the installation media to a folder on your drive and run from there. This often bypasses pathing issues. Run as Administrator : Right-click the installer and select Run as Administrator