This specific build was part of the regular monthly update cadence for perpetual Office 2021 releases.
Unlike retail versions, this is activated using the Volume License (VL) Serializer , a small package that allows for offline activation without requiring individual user sign-ins.
Word, Excel, PowerPoint, Outlook, and OneNote. Note that Access and Publisher are not available for macOS. Key Features
Office 2021 LTSC includes a specific subset of features added to Microsoft 365 over recent years: Office 2021 and Office LTSC for Windows and Mac FAQ
Microsoft Office 2021 for Mac (Long-Term Servicing Channel) is a specialized, non-subscription version of the productivity suite designed for commercial and government customers . It provides a stable, "locked-in-time" experience for devices that cannot receive frequent feature updates, such as regulated or offline systems. Core Specifications (v16.67)