Yep, what Guynmeyer said. What used to be called "Hardcore Rules" has now been rolled into the "Basic" rules. Players who want to disable the Hardcore rules for an easier gameplay experience can do so in the MyOptions file. This change was made to reduce the number of Rulesets, and also because Hardcore aligned better with the overall design of the mod than the old basic rules, which were becoming increasingly hard to balance against. But since some players still prefer the easier experience, the option is there in the MyOptions file to turn those settings off if they don't mind a more sandbox-style game.
I know its confusing because the main page still says there are 3 rulesets. I'll update the graphic and the info soon. The first priority was getting it out and making sure it doesn't crash.