Zondervan Software offers a free download of the latest Pradis 6.0, as well as electronic books via download. All you need to do is visit this site and register. Once you have created your personal account, you can download up to $25 worth of electronic books (use code AVZCS8 at checkout) for free. Obviously, you can buy any number of books and build your own custom-made electronic library, but you will receive a $25 credit regardless of your sum total. At the end of the process you will be directed to your personal download link. Click on that link to get your book(s) and the program.
I downloaded the third edition of "How to Read the Bible for All Its Worth" and "Today's New International Version" for just under $25, ran the executable and got my copy of Pradis 6 up and running in no time. The good thing is that all my previous modules from versions 5 and 5.1 are fully compatible.
Keep in mind that this offer is good through September 17, 2007 (thanks to Michael White, of Rejoice Christian Software, for the heads-up).