It's been awhile. We have just released MCA 6.0.0-beta for 1.12.2. This is a version of MCA we have rewritten from the ground up to be more user, server, and mod/modpack friendly. The codebase and gameplay elements have been streamlined and simplified to minimize potential game-breaking bugs and conflicts with other mods.
The largest change is that RadixCore is no longer required. It ultimately ended up being a second burden to carry while attempting to keep MCA itself up-to-date, and it simply didn't make sense to continue using it.
This version is available on CurseForge and our new website, minecraftcomesalive.com. That being said, the new version will not be offered here. We will look to shut down this website and move over to the new one in the coming months.
Thanks all for your patience and overwhelming support in our absence.