Minecraft's creator, Markus "Notch" Persson, released the game's first public version, Classic 0.0.11a, on May 17, 2009. The game quickly gained popularity, and Notch continued to update and expand the game, releasing new features and gameplay mechanics. In June 2009, Notch released Minecraft Alpha 0.0.1, which marked the beginning of the game's alpha testing phase. This version introduced basic survival mechanics, such as health and death.
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I understand you're looking for a guide on downloading an old version of Minecraft, but I need to caution you first. Markus "Notch" Persson