Well, according to Armaholic, “To start the launcher click Play on Arma 3 in Steam. When the Steam workshop browser detects an update for your mods it will list in in the 'Updates' page of the workshop. The mod will be automatically downloaded and.
To add a Steam Workshop mod simply click on the Subscribe button on the mods Steam Workshop page. As an example, we use the mod CBA (Community Based. Install Mods at Arma 3 For this we need the WorkshopID(s). How to install workshop mods on your Arma 3 server
How to Install Non-workshop Mods With the ARMA 3 Launcer They are disabled by default unless you enable them in. Subscribed mods will be downloaded automatically. Start Arma 3 from your Steam Library, that will open Open Arma 3 Launcher.
