Minecraft 1.8 was a development version to Minecraft, released on September 2, 2014. It is also known as the "Bountiful Update" and brought many new features to Minecraft. It made it easier for map makers to create adventure maps, making Simburbia a good one. Simburbia runs on 1.8+ and cannot run on anything before 1.8. 1.8 is now in the past, as 1.9 replaced it.