Mass import of mods using Arma 3 launcher pre-set file. I'm not 100% on this so give it a go, if not, await a reply from someone else I guess. Placing this file in your 'keys' folder of your server directory should allow clients to join the server with that addon enabled. One application for this can be server admin can create his own key for his server, and can use it to sign all addons on the server he considers safe If you download the addon you want to allow, there should be a file with the. One addon can be accompanied by multiple signatures, each signed with a different key. You need to add the mod to the server Advanced usage scenario: Server keys. Click the settings on the left of your control panel. For the mod to work, it is essential that you copy the contents of the key folder from the mod you want to install, this needs to be copied to the key folder on your server.