On the MMD6 github page it tells us: "It's technically still in "beta"" — but on the MMD5 page it says: "deprecated -- see MMD-6 instead" — we are in a deprecated ⬄ beta limbo loop! :-)
I'm pretty sure V6 is the current release, considering that is what you are building MMD-Composer around. It would be nice to have the "final" release of 6 described somewhere :-)
Thanks as always, Ian