To fix the "Preview has expired" message for Microsoft Office LTSC Professional Plus 2021, you must transition from the preview version to a licensed version. Preview versions are time-limited evaluations that automatically enter a restricted, read-only mode upon expiration. 1. Update to the Full Version
A "Preview" version is a trial build that has a set expiration date. Once it expires, the apps enter read-only mode To fix the "Preview has expired" message for
Residual Files: If the new version won't install, download the Microsoft Support and Recovery Assistant (SaRA) to completely scrub old Preview traces. Update to the Full Version A "Preview" version
The preview version is not designed to be "unlocked" indefinitely; you must obtain a full license. Method 5: Repair the Office Installation Sometimes, remnants
Sometimes, remnants of the preview get stuck in a half-activated state. A repair can reset this.
If neither of the above works, the preview components are deeply corrupted. You must start fresh.