This map was made in Beta versions but then was continued after Release 1.0, but the level.dat and McRegion files used by the map during the Beta versions survived untouched, and I have rebuilt the world file for Beta versions using these files.

The Horizon_City_Apocalypse_Demo folder is for 1.6.4, the final version, but the Rebuilt Beta Version folder is for Beta 1.7.3. I also modified the resource pack from the 1.6.4 version to work with Beta versions as a texture pack, however although Beta versions recognise it as a texture pack the textures are structured very differently in 1.6.4 and significant modification will be required to make it work properly in Beta versions. Currently the texture pack is provided in it's broken state although I may fix it someday in order to see Horizon City the way it was intended to be seen.