Where can I download a copy of Bonjour?

I’ve had a Premier 4 and Vivo Desktop ver 2.8.3 working on my home network for more than a year. Today Desktop couldn’t find the Premier. The Read Me notes suggested to remove and reinstall “Bonjour”. I removed Bonjour, however, where do I find a site that offers Bonjour for reinstall? I started a chat help session with Tivo and the tech sent me to “Tivo.com\TD” which auto installed a Tivo Desktop repair. Still no Bonjour. Any help appreciated.