Mr. Brewski

Killer update, cheers!

I bought it from 'Crappyzon', as it was so eloquently put, before I had heard any mention of BI being screwed out of the profits. If it hadn't been on sale, I probably wouldn't have bought it, but now I'm glad I did. Regardless of your thoughts on where to buy the game, OP has put in some effort to help people within this community. Good on you OP, I applaud your kind and thoughtful gesture.

Ok, hopefully this will help some of you. As far as I can tell, the Amazon copies have issues recognising that they are Combined Operations (CO), so when you try to load up DayZ it thinks that you only own ArmA2:OA, not CO. I ran into a bit of bother with this installation and ended up needing to download ArmA2:CO twice from Amazon, hopefully someone else can learn from my mistakes. First thing I would be doing is copying your ArmA2 and ArmA2:OA install folders onto an external HDD or flash drive, just in case it all goes tits up and you need to start from scratch. Amazon dropped both install folders directly to my desktop by default, I didn't get a choice where they went. Second thing is, once you've put a copy on an external source, drag both install folders into the same directory. Mine is C:\Program Files (x86)\Bohemia Interactive (You will probably need to start a new folder in Program Files and name it 'Bohemia Interactive'). Once they are in there, open your ArmA2 install folder and double click on the Setup icon (I don't want to tell people how to suck eggs, but I tried this install a few different ways and this specific method is the only one that worked for me). When I installed it to the C:\Program Files (x86)\Bohemia Interactive\ArmA2 folder it didn't work properly for some reason, so make sure that you install it to the C:\Program Files (x86)\Bohemia Interactive (or whatever directory you have chosen) directory. Once installed, a dialogue box will ask if you want to launch ArmA2, click OK and once it has booted up successfully, exit. Third, go into the Operation Arrowhead folder, which will be found in C:\Program Files (x86)\Bohemia Interactive, and double click the Setup icon. You want to install OA exactly the same as you installed the ArmA2 files. Make sure that they are in the SAME DIRECTORY (C:\Program Files (x86)\Bohemia Interactive). Once installed you will again be given the option of launching, click OK. ArmA2:OA will boot up and you SHOULD see and ArmA2 and ArmA2:OA icons in the bottom left corner of the OA menu screen. I'm no expert, but as far as I can tell, this indicates that the game has recognised that it is part of the CO pack, not just an individual game. Once it has been established that you have CO, not just OA, you can proceed as normal with the mod installation. I did everything else from here on in as is described in the OP. As previously stated, I tried installing these files a couple of different ways and this is the only way that actually worked. It is ABSOLUTELY KEY that your games are in the SAME DIRECTORY. If you are in doubt as to whether or not it is recognising that you own CO, launch OA and look for the ArmA2 and ArmA2:OA icons in the bottom left corner of the OA menu. If you are still getting errors after all of that, then I don't know what the problem is. This is the only method that worked for me, but if it doesn't work for you then unfortunately I can't help you. As a quick aside, I found both the ArmA2 launcher and Six Updater programmes to be quite useful. They're not essential, but they do make the update and launching of the mod a bit easier.

Same problem here :(