Sudden power loss or forced reboots during a Visual Studio or SDK update can corrupt the installation pathing. Step-by-Step Solutions
Select all files in this folder ( Ctrl + A ) and delete them. Skip any files that Windows claims are currently in use. Restart your computer and attempt the installation again. setup cannot locate toolkit documentation-x86-en-us.msi
Restart your PC and try your main software installation again. Sudden power loss or forced reboots during a
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. Restart your computer and attempt the installation again
The local registry thinks an older version of the toolkit documentation is still installed, but the physical cache file ( .msi ) has been deleted.
A clean slate is often the most effective solution, particularly for complex development tools:
Right-click adksetup.exe and select Run as administrator to ensure it has full system access.