1) Download both
Jon-C5- Editor and
[AS] Editor mod, or simply download
this archive.
Unpack everything into your ArmA 2:OA installation folder.
2) Now you are ready to put some new buildings on your ArmA 2 map!
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All credits for Jon-C5- Editor and [AS] Editor mods are going to their authors: Jon-C5- and Gnome_AS.