My mate has the following problem: after installing (replace old @origins folder with the new one) 1.7.9 he can't join on our server anymore. When he launches game it gives him this: Addon 'dayz_anim' requires addon 'CA_dubbing_Counterattack'
and when he tries to join server he gets this: No entry 'bin\config.bin/CfgVehicles/Citizen1.scope'.
What's the problem?

I'm getting the same issue

I get the exact same errors, but I think those aren't critical.

I've made a batch file to start Origins and try to connect via remote, but I get thrown back to the menu right away with the message "You cannot play/edit this mission because it is dependant on downloadable content that has been deleted. castructures_rail".

Edit: Okay after reading some more threads on this forum I found a fix that worked for me. I just copied the AddOns folder from ArmA2 folder to ArmA2 OA folder and now I can connect and play.

I did the same. Seems to work.