I'm usually good at finding fixes quick and easy. Hopefully someone else had this problem and can help me solve it. i've been searching high and low.

"You cannot play/edit this mission; it is dependent on downloadable content that has been deleted.castructures_rail"

Any help would be appreciated!!

I remember getting rid of this problem by simply copying AddOns folder from Arma 2 directory and pasting it to Arma 2 Operation Arrowhead.

Have you tried this one?

What ZiCell said

From your ARMA II folder, copy the Addons folder into your ARMA II Operation Arrowhead folder, or if you have space constraints, make a junction to it using a program like Magic Junction

A normal shortcut will not work!

Maybe some closer informations would help, like when did it occur, wich mods where loaded, etc.?

Still having the same problem. I copied all the files from Arma 2 to Arma 2 OA folder.

I'm running Origins from Dayz Launcher. Everything is up to date.

I can get on Epoch Origin servers, but can't get on Standalone Origin servers.

If you need info, ask. I'll help anyway i can.

Ok so i ended up downloading both versions of origins on dayz launcher.... it let me in. I"m in, don't know why but i'm not gonna complain. Thanks everyone for your help!

I believe a lot of people have issue's because they try to use Dayz Commander for this mod as a launcher . Toss it and use Steam ....

Fick15 wrote:Still having the same problem. I copied all the files from Arma 2 to Arma 2 OA folder.

I'm running Origins from Dayz Launcher. Everything is up to date.

I can get on Epoch Origin servers, but can't get on Standalone Origin servers.

If you need info, ask. I'll help anyway i can.

The Epoch Origins client, as far as I know, is an older hacked version of the original Origins client.
Glad you could get it working
Happy hunting!