macOS requires frameworks to be digitally signed by Microsoft. A manual patch from an unofficial source will often be blocked by the system.
If the framework is missing, you don't need to reinstall the entire 4GB Office suite. You can download the "Update Package" which contains all the necessary framework repairs. Microsoftsetupui.framework Mac Patch Download
Download the latest (not the full installer) for your version. macOS requires frameworks to be digitally signed by
Frameworks are version-specific; using a patch from a different build of Office will likely cause more crashes. How to Properly Patch and Repair the Framework Microsoftsetupui.framework Mac Patch Download
When this framework fails, macOS usually triggers a "Quit Unexpectedly" or "Library Not Loaded" error message. Common causes include: