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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
Herobrine Isn't real as such. He can be added manually to Minecraft by use of the Herobrine Mod. The Minecraft update log shows that they removed Herobrine every update as a sort of inside joke that no one understands.
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.
You can't "downdate" minecraft. You can only update it. But you don't have to update it.
Minecraft originally came out with spawn eggs in a pre-release - 11w49a. The update was for Minecraft 1.1, in case you are looking for an actual Minecraft update release.