A user of mine is reporting that there is a new chromecast version and my app broke. I have 4 different devices and they all have build 16041, but I have no idea where to check if that is the latest. I've tried rebooting all 4 of them already.
So is there a page or blog where that is listed?
Also as a bonus question, is there a way to get updates for when the Cast Companion Library is updated? or the sdk?
Thanks.
There is no page to tell you what the latest build is; new builds go out in batches like other updates so not everyone gets them all at the very same time.
As your second question, register yourself on Github for that project to be notified when there is a commit.
In future, it is best if you open different StackOverflow questions for different questions.