Dude, stop being an ass, just search the Steam Store for DayZ and you'll find 'DayZ Mod', and choose 'Beta'-something when it launches. If you absolutely need to do it outside of steam, then just make sure the @DayZ-folder is within the mods-folder in operation arrowhead, and launch with some launch-options such as '-mod='@dayz'' or something. Maybe even a lauch option for 'beta', or probably even an option under 'expansions' when you've started the game. Just search the web, or read some forum posts, I'm sure there is lots of information everywhere. Google it dammit.