Chromecast for Mac is created for convenience and quickly lets you broadcast or cast media onto your TV.Now that your Chromecast is connected, it’s easy to mirror your Mac’s screen on your TV. This is a far cry from setting up using a computer, something that’s now no longer possible, which used to involve downloading a Chromecast extension for Mac and entering codes to pair the device properly.That’s done by going into the Google Play store and searching for “Cast” (or perhaps the above button will. How Can I Add a City to The iPhone Weather App? As the window shows, you need to get the “Cast” extension for Google Chrome and install it. Getting Started with Chromecast on Mac OS X - Ask Dave Taylor: Search. Google Chromecast Extension Download Free.