def METHOD_NAME(self) -> bool:
    try:
        # Determine if wix_home is relative to the briefcase data directory.
        # If wix_home isn't inside this directory, this will raise a ValueError,
        # indicating it is a non-managed install.
        self.wix_home.relative_to(self.tools.base_path)
        return True
    except ValueError:
        return False