I would encourage you to read over these rules you've generated and consider how practical they are. You won't be able to control who uses /mail functions for instance. That is a standard Autcraft function. 

I wish you luck with your enterprise.

Give whatever your newest option available is a go, once you find out where to update what version you log in on. 

But remember a balance between Autcraft and real life. It's nice to come on and chat with our friends, but we don't need to be online 24/7 eh :) it would be ok if it didn't work, we'd still see you when you came online.

Yes. Backwards compatibility for Autcraft had to be shrunk because Minecraft has changed its chat, and old versions were causing those on newer versions to crash as a result.

We have several players using Chatcraft daily. You should be able to find in the app settings how to set it as being a newer, compatible version.