If you are installing from a DVD or ISO, the file may be corrupted or unreadable.
Instead of searching for a standalone "OfficeMUI.msi download"—which is rarely offered by Microsoft as a single file and can be risky—you should use these official methods to restore it. 1. Use the Office Deployment Tool (ODT) Officemui.msi Download
For modern versions (Office 2019, 2021, or 365), Microsoft uses the Office Deployment Tool to manage installations. You can use it to download a fresh, complete set of installation files that includes all necessary MSI components. 2. Run the Microsoft Support and Recovery Assistant If you are installing from a DVD or
Windows Installer may be trying to use an old, broken path from a previous Office installation. Officemui.msi Download
