When I download either the Minecraft.msi or Minecraft.exe, I get an installer that installs normally and then it downloads runtime and when unpacking it, a little window pops up that says "Unknown Error" and nothing else. It has prevented me from playing and everytime I double click the Minecraft icon on my desktop, it tries to download runtime again just to have it fail at unpacking again.
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[Windows8] Cannot install Minecraft - Runtime Error