Setup Cannot Locate — Toolkit Documentation-x86-en-us.msi

The error "Setup cannot locate toolkit documentation-x86-en-us.msi" typically occurs during the installation of the Windows Assessment and Deployment Kit (ADK). It is often triggered by corrupt installer files, insufficient folder permissions, or attempting an offline installation without the necessary local source files. Immediate Fixes

Download for Offline Installation: If you are on a computer without internet access, run the ADK setup on a machine with internet and select the option: "Download the Windows Assessment and Deployment Toolkit for installation on a separate computer". Copy these files to your target machine and run setup again. setup cannot locate toolkit documentation-x86-en-us.msi

: He remembered a colleague mentioning that a domain policy once stripped the "Back up files and directories" rights from the local Administrators group. He quickly checked his user rights, but everything was in order. The Antivirus Sentry : A post on suggested the antivirus might be silently swallowing the Method 3: Clear the Windows Installer Cache (Most

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion Microsoft Learn Open Archive . Inside

4. Clear MSI cache & retry

Method 3: Clear the Windows Installer Cache (Most Effective)

Windows maintains a hidden cache of MSI files at C:\Windows\Installer. Sometimes this cache gets corrupted. The official Microsoft tool to fix this is the Windows Installer CleanUp Utility (deprecated but useful) or the more modern Microsoft Program Install and Uninstall Troubleshooter.

  1. Download a free archive tool like 7-Zip.
  2. Right-click the original setup.exe and choose 7-Zip > Open Archive.
  3. Inside, look for a folder named Data, Files, or Redist. Extract any .msi file that resembles the toolkit documentation.
  4. Rename the extracted file exactly to toolkit documentation-x86-en-us.msi.
  5. Place it in a simple folder like C:\FixMSI and point the error dialog to that location.

Start with Method 1 (locating the file manually), then proceed to Method 3 (Windows Installer cache), and finally Method 4 (registry cleanup) if necessary. In 90% of cases, one of these three methods will resolve the issue.