Steam patched Operation Arrowhead apparently.
If your having trouble launching, try this from battleye forums - https://forums.bohem...of-life/?page=3
Dwarden
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manual fix :
copy content of
\Arma 2 Operation Arrowhead\Expansion\BattlEye\
into
\Arma 2 Operation Arrowhead\BattlEye\
... can't be fixed tonight due to logistics issues so next workday