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How to Fix Microsoft Publisher LTSC 2021 Installation Conflict with Office 2021
Question details
The user is unable to install Microsoft Publisher LTSC 2021 on a computer that already has Microsoft Office 2021 installed, as the installer halts and requests the removal of the existing Office suite.
- Product
- Microsoft Office 2021 and Publisher LTSC 2021
- Device & OS
- not provided
- Scenario
- Attempting to add volume-licensed Publisher LTSC 2021 to a system running a pre-existing Microsoft Office 2021 installation without losing the current Office setup.
- Observed behavior
- The installation process stops unexpectedly and prompts the user to uninstall the current Microsoft Office 2021 installation before it can proceed with Publisher LTSC 2021.
Ensure that both your existing Microsoft Office 2021 installation and the Publisher LTSC 2021 installer use the exact same architecture (either 32-bit or 64-bit) and identical update channels.
Verify Installation Technology and Architecture Compatibility
Microsoft Office products of the same version year must use the same installation technology and bit-version to coexist on a single system.
A common cause of installation conflicts is mixing Click-to-Run installations with Windows Installer (MSI) versions, or attempting to install a 64-bit application on a system running 32-bit Office. Both Publisher LTSC 2021 and Office 2021 must match perfectly in these aspects.
Open an existing Office application like Word, click on 'Account' in the bottom-left corner, and select 'About Word'. Note whether the installation is 32-bit or 64-bit.
In the same 'Account' menu, look at the update channel under 'About Word'. Volume-licensed LTSC versions typically use a specific enterprise channel. If your existing Office 2021 uses a different channel (like Current Channel), they cannot be mixed natively.
Ensure the Publisher LTSC 2021 installer you downloaded from your Microsoft Nonprofit portal matches the exact bit-version (32-bit or 64-bit) of your current Office 2021.
Deploy via the Office Deployment Tool (ODT)
Use the Office Deployment Tool to customize the installation and bypass standard installer GUI conflicts.
Consult the Microsoft Q&A Community for Enterprise Support
Post your specific conflict scenario to the dedicated Microsoft Q&A forum for tailored XML scripts and engineer support.
Avoid Complex Installation Conflicts with WPS Office
If you are exhausted by Microsoft Office installation errors, volume licensing conflicts, and complex deployment tools, consider switching to WPS Office. It provides a lightweight, all-in-one suite that installs in seconds without conflicting with any existing software on your PC.
- 1. Download WPS Office: Visit the official WPS website and click the free download button.
- 2. Install Seamlessly: Run the single, lightweight setup file. It installs rapidly and will never force you to uninstall existing software.
- 3. Open Your Files: Open your existing Word, Excel, and PowerPoint files directly in WPS Office with perfect format retention.
Frequently Asked Questions
Why does Microsoft Office prompt me to uninstall my current version when adding a new app?
This usually happens if there is a mismatch in the underlying installation technology (e.g., mixing Click-to-Run with Windows Installer/MSI) or a mismatch in bit architecture (32-bit vs 64-bit) between the existing suite and the new application you are trying to install.
Can I install Publisher LTSC 2021 alongside a Microsoft 365 subscription?
Generally, you cannot easily install volume-licensed LTSC versions alongside Microsoft 365 subscription versions on the same computer because they utilize completely different update channels and licensing validation methods.
What is the Office Deployment Tool (ODT)?
The Office Deployment Tool (ODT) is a command-line utility provided by Microsoft that allows IT administrators to download, deeply configure, and deploy Microsoft Office Click-to-Run versions. It is often necessary to resolve complex installation conflicts in enterprise or NGO volume-licensed environments.
