Copy "DayZ_Epoch_instance_11_Chernarus.bat" from that same folder into the "Dayz Epoch Server" on your Desktop.
Open "Config-Examples" from your Server files, then copy the matching instance number as your Mission to your "Dayz Epoch Server" folder.
Copy that to your "MPMissions" folder inside the "Dayz Epoch Server" folder that is on your Desktop.
I will be using "DayZ_Epoch_11.Chernarus" for this tutorial.
Open up "MPMissions" from your Server files and find the mission that you want.
Copy all the 4 ".dll" files from your Server files into the "Dayz Epoch Server" folder.
Open the "Battleye" folder inside the Server files and copy everything inside into the "BattlEye" folder inside the "DayZ Epoch Server folder" on your Desktop.
Copy the "Keys" folder from the Server files into "DayZ Epoch Server".
Copy from the Server files into "DayZ Epoch Server" on your Desktop.
Copy from the Client files into "DayZ Epoch Server" on your Desktop.
Take the Epoch Client and Server files that you downloaded earlier and put them on your Desktop.
Do the same for your "Arma 2 Operation Arrowhead" Folder EXCEPT any folders starting with an Click "Yes" to any popups asking you to overwrite the files.
Copy everything from inside your "Arma 2" Folder inside the "DayZ Epoch Server" folder we created on your desktop in the first step.
Usually C:\Program Files (x86)\Steam\SteamApps\common\
Click "install/update" in the top right of the window.
Do the same for Arma 2 : Operation Arrowhead.
Launch Arma 2 in windowed mode, wait until you are at the main menu, then close the game.
Create a folder, preferably on your Desktop called "Dayz Epoch Server".
(I recommend to install both 圆4 and x86 if you have a 64bit Operating system.
Install the C++ Redistributable Packages and restart your computer/box.
If you have any of the games installed previously, I would recommend deleting them to not face any problems in the future.