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you just go to the Minecraft website and download minecraft again if 1.3.1 was your latest version. or you can download minecraft version changer.
If Minecraft hasn't updated for you, you may have to force an update. When Minecraft opens, check the force update option and then log in. That should make Minecraft update for you.
yes open minecraft click force update then play minecraft.
When an update is released Minecraft will ask you if you want to update as it starts.You can update Minecraft manually by downloading the version, weekly update or pr-release you want as minecraft.jar, and replacing the minecraft.jar in the bin folder of the Minecraft directory
You can't "downdate" minecraft. You can only update it. But you don't have to update it.