Quote:Cab Update Installer is a free software program for Microsoft's Windows operating system to improve the installation of CAB updates.

Windows updates are provided in multiple ways and file formats. MSU files, for example, can be installed just like any other software program on Windows PCs. A double-click on the file is all that is needed to start the installation of the update.

Cab files, on the other hand, cannot be installed with a double-click. These update files need to be installed using DISM or PKGMGR. DISM is used on devices running Microsoft's Windows Vista SP1 and later operating systems.

The main command to install a CAB update file is DISM.exe /Online /Add-Package /PackagePath:"Path to CAB". The command needs to be run from an elevated command prompt window.

The PKGMGR command looks like this: Pkgmgr /ip /m:"Path to Cab" /quiet.

Full reading: https://www.ghacks.net/2018/12/22/cab-update-installer-for-windows/