Ensure you are running the Apple Silicon native version. Check Activity Monitor: If the process is "Intel," you have the wrong build. Download the native 16.54 from VLSC.
📍 If you are looking at a file with this specific name, ensure it is from an official VLSC (Volume Licensing Service Center) source. Unofficial zip files often bypass the Microsoft Serializer , which is the tool required to activate LTSC copies without a Microsoft Account login. To help you further, let me know: microsoft office ltsc for mac 2021 v1654zip
Microsoft uses a unified version numbering system across Office for Mac. Version 16.54 corresponds to a build released around . Key fixes in 16.54 included: Ensure you are running the Apple Silicon native version
of the LTSC suite. In a world where the standard Microsoft 365 apps were constantly changing their ribbon layouts and iconography, LTSC was the "Fixed Lifecycle" champion. Once installed, it didn't change its look; it didn't add experimental AI features overnight; it just worked. 📍 If you are looking at a file
: Office LTSC 2021 for Mac is governed by a Fixed Lifecycle Policy and is scheduled to go out of support on October 13, 2026 . After this date, it will no longer receive security or quality updates.