Mojang no longer distributes "new" or standalone installers for Alpha 1.0.16_02. You cannot buy a fresh copy of this version.
Minecraft Java Alpha 1.0.16_02 is an older version of Minecraft, released on February 16, 2010. This version is part of the alpha stage of the game's development. minecraft java alpha 10 16 02 download new
You might wonder why anyone would leave the lush caves of the Caves & Cliffs update to return to a world where you can't stack food, where water evaporates in the Nether (but not before flooding it), and where the only wood type is Oak. Mojang no longer distributes "new" or standalone installers