Hello survivors. The Epoch Napf and Overpoch Chernarus servers have now been updated to the steam version (122548) Everything should be fine and all players should be able to join.
The transition might have some minor errors here and there but we will iron those out over the next 24 hours.
So, get yourself updated and I'll see you in the apocalypse!
In case you are having trouble updating, please refere to this video from MCD: