For a clear walkthrough on how to officially install and set up the game for the first time, check out this guide:
: Bohemia Interactive offers various DLCs and "Creator DLCs" that add new terrains, vehicles, and missions, though these are typically paid additions. arma-3-free-download-pc-game-full-version
: The official and most secure way to get the full version of Arma 3 is on Steam . It frequently goes on sale during seasonal events. For a clear walkthrough on how to officially
: If you are looking for a free experience from the same developers, Arma 2 Free was previously a standalone free version, though its official support has largely shifted to newer titles. arma-3-free-download-pc-game-full-version