I suggest starting with Age of Awakening, which is available in the previous iteration, and simply patching the spots where the rules differ.
oh dang, there it is.
Wish I'd noticed before we just charged into it. Game went great despite everything, can't wait to play the fancy full release in one to ten years or whatever.
it's also extremely funny to me that three of the people at the table had the experience of looking for this chapter, not finding it, looking up the only playtest that exists, and hearing it start with "we didn't bother to record the setup" so that didn't help lol