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Activation Problems

Fix Office 2021 Remaining Active After Installing Office LTSC 2024

Maira MehtabMaira Mehtab Sep 22, 2026 868 views

Question details

The user needs to resolve an issue where Office Professional Plus 2021 remains the active and dominant installation on Windows 11, even after attempting to replace it with Office LTSC Standard 2024.

Product
Microsoft Office
Device & OS
Windows 11
Scenario
Upgrading or switching from Office Professional Plus 2021 to Office LTSC Standard 2024.
Observed behavior
Despite standard removal and reinstallation, Office Professional Plus 2021 (version 2408) automatically reactivates and supersedes the new Office LTSC Standard 2024 setup.
Before you start

Ensure you have your Office LTSC Standard 2024 product key and installation media readily available before beginning the complete removal process.

Solution 1Recommended

Perform a Complete Manual Removal of Office 2021

Standard uninstallations often leave behind registry keys and license tokens. Utilizing Microsoft's official complete removal tools ensures no residual Office 2021 configurations conflict with your new installation.

When an older version of Office is not completely scrubbed from the system, Windows may detect the lingering license tokens. This causes the older version (Office 2021) to override the newly installed version (Office LTSC 2024).

1
Download the Official Uninstall Tool

Download the Microsoft Support and Recovery Assistant (SaRA) tool from the official Microsoft support website to perform a deep uninstallation.

2
Run the Recovery Assistant

Launch the SaRA tool, select 'Office' from the list of products, and choose 'I have Office installed, but I'm having trouble uninstalling it.' Follow the prompts to select Office Professional Plus 2021 for complete removal.

3
Restart Your PC

Once the tool finishes removing all files and registry keys, restart your Windows 11 computer to clear the memory and finalize the uninstallation.

4
Install and Activate Office LTSC 2024

Run your Office LTSC Standard 2024 setup file. After the installation is complete, launch Word or Excel and enter your product key to activate the new software.

Command Prompt Alternative: Advanced users can use the ospp.vbs script via an elevated Command Prompt to manually un-provision the specific Office 2021 product keys before reinstalling the newer version.
Free Microsoft Office alternative

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  1. 1. Download WPS Office: Visit the official WPS website and download the free installation package for Windows.
  2. 2. Install the Software: Run the downloaded installer and follow the simple on-screen instructions to set up the software.
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Frequently Asked Questions

Why does Office 2021 keep activating after I uninstalled it?

A standard uninstallation via the Windows Control Panel often leaves behind residual license files and registry keys. When a new Office version is installed, the system detects these old keys and automatically reactivates the previous version.

Will the Microsoft Support and Recovery Assistant delete my personal files?

No. The SaRA tool only removes Microsoft Office application files, settings, and license configurations. Your personal Word documents, Excel spreadsheets, and other user data will remain completely safe on your drive.

How do I check which version of Office is currently active?

Open any Office application, such as Word, click on 'File' in the top-left corner, and select 'Account' at the bottom left. The currently active product version and its activation status will be displayed under the 'Product Information' section.

Can I have both Office 2021 and Office LTSC 2024 installed on the same computer?

It is not recommended to install multiple versions of Office that use the same installation technology (like Click-to-Run) on the same computer, as they share registry components and can cause severe activation and default-app conflicts.