Refers to Build 15629.20208 , a specific update released around April 2023 for the Office Deployment Tool and Office 365/2016/2019 products.

This is the extension for the second part of a split ZIP or 7z archive. You would typically need part z01 , z02 , and the final .zip file in the same folder to extract the full installer. Technical & Security Context Update history for Office 2016 C2R and Office 2019

Likely stands for Multilingual , indicating the installer includes multiple language packs.

Indicates that the download is split into chunks of 2 GB each.