If you are a commercial or government customer, you can install the official version via your Microsoft Volume Licensing Service Center (VLSC) .
Navigate to C:\ProgramData\Microsoft\Office\Licenses (you may need to "Show Hidden Items" in File Explorer). in this folder. If you are a commercial or government customer,
If the new version won't install, download the Microsoft Support and Recovery Assistant (SaRA) to completely scrub old Preview traces. If the new version won't install, download the
Below are the step-by-step fixes, ranging from simple to advanced. Fixing this requires transitioning from the preview license
The "expired preview" error in Microsoft Office LTSC Professional Plus 2021 typically occurs when a pre-release version of the software reaches its end-of-life date or when a preview-period license key is no longer valid. Fixing this requires transitioning from the preview license to a valid, permanent license—either a MAK (Multiple Activation Key) or a KMS (Key Management Service) license.