Well, the better question is for what program actually? If you use anything but CC or CS6 this simply won't work and inevitably this would also be the reason why checking for updates from within the program may not bring up anything...
I am using CS6
Are you on a new enough OS version? ACR 8.4 requires Win7-8.1 or OSX 10.7+. What happens when you do a Help / Updates inside of PS-CS6?