https://www.youtube.com/watch?v=Nz6mcyyP_VkSo, this could be a potentially late tutorial, but it's tutorial nonetheless illustrating the process of getting Arma 2, Arma 2 Operation Arrowhead, DayZ Epoch, and DayZ Overwatch running for the beautiful Napf server. At least, this is how I've been launching the server all this time.
Overall summary of the process.
Install and launch Arma 2. (you need to launch/play the game to fully install the files to your computer) [verify files if you already have game installed]
Install and launch Arma 2 Operation Arrowhead. (you need to launch/play the game to fully install the files to your computer) [verify files if you already have game installed]
(Install any additional DLC) [British Armed Forces, Private Military Company, Army of the Czech Republic]
Download and install DayZ Launcher https://dayzlauncher.com/
Search for "Beatnik". Click the Download icon. DayZ Epoch and DayZ Overwatch will start downloading and installing.
Change the mod/download path to Arma 2 Operation Arrowhead folder. (You can move the mods that are downloaded by default to C:\Users\(user)\Documents\mods and move that straight to the A2 OA folder.)
Launch Beatniks server and pray no issues occur in the meantime. Some errors may occur but may not affect gameplay.
Hope this guide helps. And hope to see you guys for the reunion.
_Edge