refers to a specific, historical build of the Long-Term Servicing Channel (LTSC) version of Microsoft Office for macOS. Unlike the standard Microsoft 365 subscription, LTSC is a perpetual release designed for commercial and government organizations that require a stable, "locked-in-time" software environment without frequent feature updates.
file, it is important to distinguish between official deployment methods and third-party archives: Microsoft Office LTSC for Mac 2021 v16.54.zip