This is a replica of the Generation One version of Optimus Prime from The TRANSFORMERS™.  The world download includes the standard robot version of Optimus as well as a version with the chest open to reveal the Autobot Matrix of Leadership.  The zip file also has various screenshots as well as both versions of Optimus Prime in schematic format.  To install the world file simply navigate to the zip and extract the G1 Optimus Prime folder into your saves folder.  A standard path for this is "C:\Users\(Your Username)\AppData\Roaming\.minecraft\saves".  The Schematic files are located in the base directory of the zip, simply extract them to any desired location on your hard drive.  Alternatively, you can download the schematic file from the MCEdit Schematic section on this website; this version has both versions of Optimus Prime included side by side in one schematic file.