Dear razie, you can contact Alstom support via contact form on the website and ask for additional information. They will give you access on their ftp-server with information you ask for. Yesterday I downloaded new version of MiCOM S1 Studio following this procedure.
What is your exact task - do you have to design new project with AREVA DCS, or to maintain existing system? In both ways I would suggest you to ask for support and good training in their training center. As I remember, PACiS is quite complicated system comparing with similar system from Siemens, for example. At least 6 years ago it was like that. I know AREVA developed it in mean time and hope they made it more user friendly, but for first project I wouldn't be so brave to start without manufacturer's support.
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It may be like this in theory and practice, but in real life it is completely different.
The favourite sentence of my army sergeant