However, Chromecast App is no longer available for download on Computers and currently the only way to Setup Chromecast Device is by downloading. Previously, it was possible to Setup Chromecast on Mac by downloading the Chromecast App to computer and completing the entire setup process directly on a MacBook. You need to use the Google Home app on a mobile device. Setup from your desktop computer is no longer supported. I am unable to download the appropriate app onto my Mac to run Chromecast from my computer.