Since the update to 1.62.95417 I have this issue as well. Most servers will say I have a "Bad version, server rejected connection." Another friend of mine has it as well. Other friends don't have this issue and can join any up to date server. I use the six updater to update my game, nothing else. I use the Dayz Commander to luanch my game and join a server in most cases, but sometimes the multiplayer browser ingame as well. Both give the same results. I have no clue what caused this or how to solve it, any help would be appreciated.