This is the oldest known surviving world from Chaotic United. It's a copy of the Survival world, as of Beta 1.7.3. The download does not contain a Nether world.
The screenshots were taken in MC 1.11.2, so there may be some minor differences due to biomes and other technical changes with Minecraft. The original save within the download has never been loaded in anything besides Beta 1.7.3 - so don't worry .
This file is available thanks to Kendev, as he uploaded it initially on PlanetMinecraft - go show him some love here: https://www.planetminecraft.com/project/chaotic-united-173-spawn/