Well, the addon is in the OA section, that means at least OA is required.
Additionally it says the following:
Requirements: OPX Addons, signs addon, Arma 2
So, it needs those other addons as well as Arma 2.
Meaning you need to run the game as a CO install (Arma 2& Arma 2: OA combined), running the map on any standalone wont work as you already noticed.