Contrary to what the name suggests, this is not a separate app you need to keep. It is a temporary background process used by Microsoft AutoUpdate to decompress and apply delta updates (patches) to Office applications like Word, Excel, and Outlook.
When the update mechanism detects a mismatch between the patch and your current Office build or Mac architecture (Intel vs. Apple Silicon), it throws the "No equivalent application" error.
On macOS, Microsoft applications (particularly older versions of Office 2016, Office 2019, or standalone installers like Skype for Business) use an internal framework called MicrosoftSetupUI.framework. This framework is part of the Microsoft AutoUpdate (MAU) or the Office installer package. Microsoftsetupui.framework Mac Patch Download
When this framework becomes corrupt, missing, or version-mismatched, Microsoft applications may fail to launch, fail to update, or display errors like:
“MicrosoftSetupUI.framework cannot be loaded” or “Installation failed because a required component is missing.” Contrary to what the name suggests, this is
sudo atupdate
Replace paths based on your actual extraction results. “MicrosoftSetupUI
Downloading the full Office installer ensures you get all frameworks, including Microsoftsetupui.framework. You can use the “Reset” method to extract only the framework (explained later).