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I just fixed this for myself, same exact issue. Browse to the DayZ game installation folder and find the folder marked "dta" and "addon". Inside those look for any '.pbo' files that have a different date than the one from the game installation and delete them. I had the game installed for nearly three years my files were easy to spot. Hope this helps. Edit: Another way is to delete the 'dta' and 'addon' folder completely then have steam verify file integrity to download the missing pieces.

The error "Client contains PBO which is not part of server data" is from not having the proper key files for all of the addons added into the "Keys" folder! In 1.04 BI changed bikeys, most mod developers resigned their addons with the new version. So do a double check and make sure all of the new addon keys have been added! Setting verifySignatures = 0 is a good bypass to this, however you need to make sure you edited the correct serverDZ.cfg (edit the one in the admin folder), then when starting the server make sure you check the "Skip Save Config" one time toggle each time you start the server!