Update: Snapshot 13w37b has been released, along with a pre-release of 1.6.3. You can select these versions in your launcher, or download the server links below.

We still strongly recommend that you don’t run the snapshots on an existing world if you don’t want to run into chunk errors. There is a known issue with world structures such as Nether Fortresses not transitioning to 1.7 from 1.6, but loading these areas in the new pre-release 1.6.3 and then going to snapshot 13w37b (or later) should fix this.

To get snapshots, open your launcher and press the “New Profile” button. Call it “snapshots” and check the box saying “Enable experimental development snapshots” and save. To switch to the normal version, you can select it in the dropdown at the bottom left corner of the launcher. To get the pre-release, do the same but manually select “1.6.3″ from the version dropdown list.

Server files (For snapshot 13w37b):

Cross-platform jar: https://s3.amazonaws.com/Minecraft.Download/versions/13w37b/minecraft_server.13w37b.jar
Windows EXE: https://s3.amazonaws.com/Minecraft.Download/versions/13w37b/minecraft_server.13w37b.exe

Server files (For the 1.6.3 pre-release):

Cross-platform jar: https://s3.amazonaws.com/Minecraft.Download/versions/1.6.3/minecraft_server.1.6.3.jar Windows EXE: https://s3.amazonaws.com/Minecraft.Download/versions/1.6.3/minecraft_server.1.6.3.exe

~SpartanNova