If the AutoUpdate tool fails, you may need to reinstall the specific "Installer" package: Office for Mac Release Notes Find the "Install package" for the most recent version.
Sometimes the framework is fine, but MAU’s preferences are corrupt: Microsoftsetupui.framework Mac Patch Download
Download the full Microsoft Office suite installer (ARM for Apple Silicon or x64 for Intel) from Microsoft’s official website and run it directly over your existing installation. This will replace the problematic framework, preserve your data, and get Word and Excel running smoothly again within 10 minutes. If the AutoUpdate tool fails, you may need