When Google announced the new Chromecast and Chromecast Audio they also announced that Spotify would be making its debut as well. Needless to say, that made a lot of people rather happy. At launch though, the inclusion of Spotify to the Chromecast family didn’t support the original Chromecast devices that were already out in the wild. Support was said to be coming though. It would now appear as though the necessary firmware update to allow you to cast to your original Chromecast is currently rolling out.
To get the updated firmware on your device you can power cycle the device. If the update was already downloaded it will update when it boots back up. Power cycling can sometimes trigger the update to download as well if it hasn’t already. You can always see if it installed when you weren’t looked by opening up Spotify and checking to see if you can cast or not.
There is one critical thing to know about how to cast though. By default Spotify is free and offers a monthly subscription to the service just like many others out there. With Spotify the “Premium” service enables Spotify Connect. If you plan to cast to your 2nd of 1st gen Chromecast, you need to have Premium to use Spotify Connect in order to do it. Needless to say, if you don’t pay, you can’t play.