It seems the people involved with Origins have moved onto Arma3 and are no longer interested in Arma2 related Dayz so there's been a release (so to speak) of some of the files needed for your own server. Check it out here =>
http://opendayz.net/threads/release-dayz-epoch-origins.20269/You'll need Dayz Epoch (1.0.5.1) and Dayz Origins (1.7.8.5) which you can get from Dayz Commander.
You'll also need the server files
here.