Once you fix the issue, prevent it from recurring:
: Downloading MSI files from third-party websites is risky and not recommended. Always use official Microsoft sources for Office components. Officemui.msi Download
Sometimes, deleting the C:\MSOCache folder and restarting the installation forces Windows to re-copy the necessary .msi files from the source. Once you fix the issue, prevent it from
Downloading and installing Officemui.msi can seem daunting, but by following the steps outlined in this article, you should be able to successfully obtain and install the file. Always prioritize downloading from trusted sources to minimize security risks. If you encounter any issues, refer to the troubleshooting section or seek assistance from Microsoft support resources. Downloading and installing Officemui
: Through the Windows Control Panel (Programs and Features), selecting "Change" and then "Online Repair" will force Office to re-download all necessary components, including any missing MUI files, directly from Microsoft’s secure servers.