Correct link to Download EP with CAF -Guided procedures

Hi

I am looking to build some prototype workflows on CAF- GP ( Guided procedures ) . I understand that GP runs on enterprise portal 6.0 and higher. Could anyone please forward me the correct link to a sneak preview download of enterprise portal - that comes along with GP ? I tried many links given in weblogs on EPs - but none of them take me to a location wherein I can download the sneak preview of EP 6.0 or higher ...

Please help...