UPDATE 11/08/2012Sooner than I expected (much much sooner) the server has been updated and is now running DayZ 1.7.2.5
You can either download direct from here.
http://uk1.dayz.nu/latest/or using
www.worrom.com 's DayZ updater.
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Ok, as there is some confusion of the manner in which to install and run DayZ in concordance with the WPC server I thought I'd lay out the instructions step by step.
-If you are currently using Six Updater.1.Start by un-installing Six Updater/Launcher. Any program that forces an update shouldn't used as DayZ releases are more often than not broken on release.
2.Open your desk draw.
3.Put your fingers in the draw.
4.Slam draw shut.
Six Updater/Launcher should now be successfully un-installed, if it's not repeat steps 2 through 4.
Getting Going with DayZ1. Download and install DayZ version 1.7.2.5
I recommend using
www.worrom.com 's DayZ updater.
2. Extract the files to
..\Steam\steamapps\common\arma 2 operation arrowhead\@DayZ\Addons.
Overwrite when asked. (DayZ Updater does this for you.)
3. Download and install the Arma2 Launcher.
http://www.armaholic.com/page.php?id=82414.Set up the launcher as shown below.

Drag and drop the addon from left to right to be able to turn it on.
If you can't see DayZ in the Available Addons then tell the launcher where to look.

Tell the launcher where your exes are. Select Run Beta and No Splash Screen. Performance is dependent on your system, this screen shot shows the setup for my system. Don't change yours unless you know what you are doing.
UPDATE - UNCHECK BETA


On the game version Select "ArmA II - CO" and launch the game.
Steam UsersAdd this line to your launch options.
-mod=@dayz -nosplash
You should now be able to join WPCs Server.
WPC will update it's server when we know the newer versions of DayZ work.
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Lair Keeper - Long Fang - Pack Keeper