Hmm, I'm downloading the Recommended version now - hopefully that will help. I hadn't thought of that, I always assumed the "Modpack Name" (vX.X.X) in the mod list on the left was listing the stable version number.
[EDIT] Okay, downloading the Recommended version does not have the pre-generated world in Agrarian Skies.
I don't really want to try my luck with the vast amount of online world downloads.
[EDIT #2] Version 2.1.1 has the pre-generated worlds if anyone with my question happens uppon this. Now to update again to 2.1.9