Avid Media Composer: First Installation and Download Avid Media Composer | First - Installation and Download This quick tutorial is good for anyone who wants to download Media Composer First for the first time. First is great for people who want to get a feel for Avid before purchasing, up their editing game from iMovie, or for the complete beginner. Read this article here that describes which Avid products work with the macOS 10.15 (Catalina) operating system from Apple.Learn more about Avid at Avid.com or check out the Avid Articles on the Helpdesk Knowledge Base page. Download