The same problem here. I'm running a MacBook Pro with the latest version of Mavericks.
A few days ago, I was informed that there was a new version of the Creative Cloud and the installer. I installed them, as usual, and continued to work. Yesterday, the system informed me that there were 4 updates, so I started the installer. First of all, it informed me that it needed access rights, so I clicked on the message. All I got was the apps page and the spinner. After half an hour of waiting (I was checking emails and updating my blog), the spinner was still running.
It's as though it can't get through to the servers, or maybe it's just sitting there twiddling its thumbs. I know that the Internet connection works, because I'm able to post here.
Come on Adobe, you can do better than that!