The latest Mac update is 10.8.4 which is still called Mountain Lion.
Are you talking about the developer preview of Mavericks? Only folks in the Apple developer program would have any access to that. You would be completely in uncharted waters if that is what you were trying to do. The Apple Developer forums would be a better place to ask that question.
Adobe After Effects CS6 (11.0.3) has been released. This update fixes many crashes and other bugs.
This update is required to run After Effects CS6 on Mac OSX v10.9 (Mavericks).
After Effects CC (12.1) is due for release soon, and it includes the same fix to enable operation on Mac OSX v10.9 (Mavericks):