This is the earliest build of the 2015 client, this build was made in November 5th, 2014, 4:23 PM. There was a lot of bugs in this build. Jumping was very buggy and jumping on platforms would get you stuck in the ground unless you jumped again. In this build, they were aiming for a 2D look so it was easier for the player, but they scrapped it because they would have to rebuild the whole client if they did. 2 builds later they switched to 3D which is Ver 3.1.
Some scripts from @kingsten77 to make it as close as possible to it.