Don't quote me on this but it maybe a feature that's unlocked when you get a key for it.
I have it here and it's working fine. There has been a few things I've had to download but being a registered (key) version it's just downloaded and installed without issue but I don't remember if this was one of them.
You could try downloading the latest version of CM, there has been a few updates sins I've installed it. But this has been automatic for me.