Hi @vishal_
Cloudera Express is no longer available, please see the announcement here: Cloudera Enterprise 6.3.3 Released …and scroll down to the section titled Important Note About Cloudera Express.
With regard to your other questions, "how do I get the enterprise edition with the credentials. And what will be the cost for it", you can see answers to those two questions in this recent thread: Hadoop vendors.
What @Daming Xue wrote above will be your best option if you're looking for a trial of an up-to-date Hadoop distribution.
Bill Brooks, Community Moderator
Was your question answered? Make sure to mark the answer as the accepted solution.
If you find a reply useful, say thanks by clicking on the thumbs up button.