This is a little confusing.
I purchased the Arma2 Combined Ops which contained both Arma 2 and Arrowhead.
I installed both disks and updated the game to 1.08 for Arma2 and 1.57 for CO.
I then downloaded the 1.09 Arma2 patch and applied it. After the update, I ran the Arma2.exe and the game now says it has been updated to version 1.09. Launching the Arma2oa.exe tells me it is version 1.57 which it should be.
Now, the million dollar question, did I just break my game? Folks have mentioned that the patch is for the standalone arma2 version which I have sitting right next to Combined Ops.
Thanks, Sawacs