The interval program is currently at 1.8.2 (latest). I understand the changes in 1.8.3 and 2.0.0 are currently being worked in but in the meantime the best place to check for bug fixes etc are the forum.
The best way to update is to use Github and pull changes as they are announced. As things streamline I am sure the process will get easier. Right now a lot of new developers who have never worked with each other, using different languages and tools came together and built some epic things! But there are rough edges.
Hopefully Ray sees this and maybe updates that blog post. I asked because as I read it I realized a critical piece was missing. He did post a newer blog post however with a nice YouTube video! http://rayshobby.net/?p=6749