Hi Yoshinori,
The classification of General Availability, Early Availability and Patch Release does not exist on the CAS like it does on the ProxySG. I would consider everything in the downloads portal for CAS the equivalent of a General Availability.
Additionally, if you are worried about being a first adopter of a version, you can see the date when a version came out in the downloads portal. 3.0.2.0 has been out since July, and I personally use it, and have had a good experience with it.