You only need Queen's Gambit on a small numbers of servers if they use content from the expansion but you can't do much wrong with getting the AddOn because it comes with the latest patch 1.08.
You have to manually install it unless you have the steam version of ArmA and also there are two beta patches (1.09 and 1.12) you can't do anything wrong with installing 1.12 It won't overwrite the normal version.
You have to manually install it unless you have the steam version of ArmA and also there are two beta patches (1.09 and 1.12) you can't do anything wrong with installing 1.12 It won't overwrite the normal version.
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