How to install Arma 3 overpoch.

First, install CCG Launcher.
http://customcombatgaming.com/forums/index.php?/topic/1605-ccg-launcher-download-and-instructions/


Open it up and make sure all the paths in settings are correct, and also set a mods folder for CCG launcher.
(Try to keep it outside of your steam folder.)

Torrent these 4 things either straight to the CCG Mods folder or move them into the folder afterwards:
http://ccg.launcher.eu/@AllInArmaTerrainPack.torrent
http://data.a3launcher.com/torrents/@mas18.torrent
http://data.a3launcher.com/torrents/@Epoch-0304.torrent
http://data.a3launcher.com/torrents/@Emod031a.torrent

Open the launcher and go to the servers tab, pick the game  "A3 - OP" and pick the server you want to play. HF