it sounds like you are downloading mods that aren't supported by the server.
The za servers don't have battleeye so there shouldn't be any issues with keys. If you run the ZA repo through six and launch game, it will only load up the mods required by server to play. So there shouldn't be any issues.
The mods add a more realistic play style, especially ACRE for the radio's and voice chat via TS.
Za definitely isn't for the faint hearted, but those keen for milsim game play and some really rocking missions will get a kick out of it




