Security software can mistakenly flag the download or execution of these background installers as suspicious activity, causing the setup to halt.
If the error persists, temporarily disable your antivirus or web filter (e.g., Sophos, Windows Defender) during the installation process to ensure it isn't blocking the download of the .msi files. setup cannot locate toolkit documentation-x86-en-us.msi
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. Security software can mistakenly flag the download or