I am getting this exact same problem joining Epoch servers. Dayz/Arma/beta/Epoch are all the most up to date versions. Using commander to filter servers for version correctness and I still get the bad version error. I have googled and tried the most popular 'fixes' - to no avail. Copying add-on content, settings within commander to force use of the beta, verifying local file integrity in steam, etc., etc. Has any one else had this and actually managed to remedy the issue? Any help would be greatly appreciate and beans distributed for any success.