Encountering the error message "Microsoft Office LTSC Professional Plus 2021 Preview has expired" can be frustrating. You are mid-way through an important report, spreadsheet, or presentation, and suddenly, Office locks you out. Buttons are greyed out, menus disappear, and a persistent dialog box blocks your workflow.
If you prefer a visual guide, these videos show you exactly how to clear those expired preview warnings: How to Fix "Microsoft Office LTSC Professional Plus
To avoid licensing conflicts, you must remove the expired preview before installing the new version. Standard Method Settings > Apps > Apps & features If you prefer a visual guide, these videos
Once the expired license is removed, you can activate the full version if you have a purchased key. For a robust fix, users are advised to
Since LTSC is a volume-licensed product, it requires specific deployment steps.
For a robust fix, users are advised to use the official "Microsoft Support and Recovery Assistant" (SaRA) tool. This tool is specifically designed to scrub all traces of Office from a system. Alternatively, for IT professionals managing bulk deployments, the Setup.exe /configure command using an XML configuration file with the RemoveApp element is the standard procedure. This ensures the system is a "clean slate" for the legitimate software.
Ensure that your system's date and time settings are correct: