The previous version are here if you wish to download, however neither the team nor this wiki provides official support for any of the previous versions to 4.0 Demo. This is purely for entertainment purposes and, in addition to not providing any support, the team will accept no suggestions to modifications that should be made to the mod. These versions may have bugs or may even be incompatible, any installation of a version is at your own risk and peril. Here is a video to have both 4.0 and 3.8.1 at the same time
All previous versions can be downloaded from here: Link