helprequired

ok so i downloaded arma 2 combined operations off of steam and arma 2 works but operation arrowhead does not it comes up with and error saying " No entry 'bin\config.bin/cfigingameui/mptable.shadow' and connot open file 'c:\ program files (x86)\steam\steamapps\common\arma 2 operation arrowhead\expansion\addons\dubbingradio_epbo expected 193371979b got 164495360 please reply thanks this happens when i start it up