The current, major version of Sybase EP is 5.1.1. But there exists a small version, the evaluation version. This version of Sybase EP is very easy to install and is great for playing around with and getting used to the Sybase EP and the idea behind it (and the best: it is for free). The installation takes just minutes, and you are up and running and you can start with your own portal and build your own pages within the portal on your machine.
Of course, you will not have the full power of the full version. You will not be able to use the security architecture for single sign-on, the search service, and you do not have the full power of Sybase EAServer with its J2EE features and component architecture behind it.