Just to let you all know, I am in contact with wd about the upgrade. He is working on it though there are some difficult issues to deal with that take more time than he has to dedicate on any one day lately. Here is the latest I've heard from him on 1/3/2018:
"So obviously that didn't work. I spent a couple of hours looking, but the only clear path to upgrade is if we abandon several different plugins. The worst problem is still the need for me to hand covernt from the per world inventories we have to multiverse inventories. I'll check in when I can :/"