In the preloader, there's a button next to log in for Options. In there is a command called Force Update. This will download a fresh version of the program, even if you have the same update already. There's no practical method of extracting a mod from the jar file, especially if it overwrites in-game files (which they generally do), so downloading a new install is the best way to go.
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You can email Minecraft if you have any questions about Minecraft. That's what the Minecraft Help Email is.
There are no schools in Minecraft and/or a school that teaches minecraft.
To get Minecraft for free, you need to download it on Xbox.
The beta version of Minecraft was released on December 20, 2010.* * Minecraft-beta came after Minecraft-alpha, but before Minecraft 1.0. You can play Minecraft-beta with the new launcher.