Install version 6.1 #201 from http://eclipseclp.org/Distribution/6.1_201/
Use i386_linux or x86_64_linux for 32-bit or 64-bit Linux binaries, and i386_nt or x86_64_nt for Windows binaries.
Or, if you are adventurous, install from source.
There are MacOS binaries for version 6.1 #164 at http://eclipseclp.org/Distribution/6.1_164/x86_64_macosx/
If you are adventurous, you can try to install newer version from source.
Using the command line run the following command in the directory with this README.md and verify-installation.ecl files:
$ eclipse -b verify-installation.ecl -e main
The output should be:
Looks good!
Prolog experience isn't assumed for the workshop, but would be helpful. For a quick introduction look through "Beginning Prolog: Basics" section of http://en.wikibooks.org/wiki/Prolog