I'm pretty sure CS6 will not run on Yosemite. If you want to use CS6, you have to use a version of the Mac OS that is older than Yosemite.
> I'm pretty sure CS6 will not run on Yosemite.
That is false.
After Effects CS6 will run on Mac OSX v10.10 (Yosemite) as long as the After Effects CS6 (11.0.4) update has been applied:
To the original poster, what exact update are you trying to apply that gives that error message?