Anything CS6 and older has EOL. Only CC versions are supported now.
CS6 is almost four years old.
They still sell CS6 but only by phone. The phone agent will make it clear that CS6 may not work well with the newer operating systems from Microsoft and Apple.
EOL versions (except maybe for 6 months for CS6 if purchased now) will get no phone/chat support and you'll be referred to the forums, and be on your own.