If you are installing from a physical DVD and encounter this error:

: Check the C:\MSOCache folder, which is where Office stores local installation source files. If propsww2.cab is missing here, you may need to re-download the ISO from an official Microsoft source .

The "Proplus.ww\Propsww2.cab" file is a cabinet file, which is a type of compressed archive used by Windows to package files. The ".cab" extension stands for Cabinet, a file format used for compressed data.

(.cab), which is a compressed archive containing multiple setup and configuration files. In this context, it holds essential data for the Professional Plus edition of the Office suite. Common Causes of Errors