Bonjour 2.0.x introduced several improvements over the 1.x line. Version 2.0.4 inherits these and adds refinements:
Devices such as networked printers, shared music libraries in Apple iTunes, and remote databases in Claris FileMaker Pro rely on this service to find one another. bonjour 2.0.4
This specific version is often bundled within other Apple software installers (like older versions of iTunes or Safari) rather than being offered as a standalone download on Apple’s website. Key Features and Functionality Bonjour 2