Fix Office 2019 and Access 2021 Compatibility and Installation Issues
Question details
The user is unable to install or run Office Home & Business 2019 and Access 2021 LTSC together on the same computer due to conflicting installation technologies.
- Product
- Microsoft Office Home & Business 2019, Microsoft Access 2021 LTSC
- Device & OS
- not provided
- Scenario
- Attempting to install standalone Access 2021 LTSC on a computer that already has Office Home & Business 2019 installed.
- Observed behavior
- The installation fails or the programs refuse to run because one product uses Click-to-Run technology while the other uses Windows Installer (MSI), which are incompatible on the same machine.
Verify whether your currently installed Office applications use Click-to-Run or Windows Installer (MSI) technology by checking the 'Account' or 'About' section within any open Office app.
Uninstall and Match Office Installation Technologies
Since a single computer cannot run both Click-to-Run and MSI installations for Office products, you must standardize your software to use only one of these technologies.
Microsoft 365 and most modern Office retail versions utilize Click-to-Run, while some volume-licensed standalone products use Windows Installer (MSI). You cannot mix these two technologies for Office, Access, Visio, or Project on the same device.
Open an existing Office application such as Word. Navigate to File > Account. Look under the Product Information section; if you see 'Click-to-Run' listed next to the version and build number, you have a Click-to-Run installation. If not, it is likely an MSI installation.
Open the Windows Control Panel and go to Programs > Programs and Features. Find the Office or standalone application (like Access 2021 or Office 2019) that uses the conflicting installation technology, right-click it, and select Uninstall.
Once the conflicting software is removed, download and install a version of Office and Access that share the exact same installation technology. For example, ensure both are Click-to-Run versions to guarantee seamless operation.
Switch to WPS Office to Avoid Complex Installation Conflicts
Skip the headache of Click-to-Run and MSI technology conflicts. WPS Office offers a unified, lightweight installation process that provides full document, spreadsheet, and presentation capabilities without the strict compatibility rules of Microsoft standalone products.
- 1. Download the installer: Visit the official WPS Office website and click the free download button.
- 2. Run the setup: Open the downloaded installer file and follow the simple on-screen instructions.
- 3. Start working immediately: Launch WPS Office and seamlessly open your existing Microsoft Office documents without worrying about version conflicts.
Frequently Asked Questions
Can I install MSI and Click-to-Run Office versions on the same PC?
No. Microsoft enforces a strict rule that prevents the installation of Click-to-Run and Windows Installer (MSI) products of the same or different versions on the exact same computer.
How do I know if my Office suite is Click-to-Run or MSI?
Open any Office application, navigate to File > Account, and look at the Product Information section. If 'Click-to-Run' is mentioned next to the version details, it is a Click-to-Run installation. If that text is absent, it is usually an MSI version.
Does this installation conflict affect other Microsoft products like Visio or Project?
Yes, this technology restriction applies to all Microsoft Office suites as well as standalone applications including Access, Visio, and Project. They must all use identical installation technologies to coexist on one computer.
