You do need to download sketchy files from the internet to play this version. The official Minecraft Launcher contains an archive of almost every version of Minecraft ever released.
If you prefer doing things the hard way (or want to manually backup the JAR), follow this manual installation guide. minecraft+alpha+v101602+download+install
If you own the game legally, you don't actually need to download external files! The official launcher supports this version. You do need to download sketchy files from
Searching for "v101602" is a digital archaeological dig. It represents a desire to return to a simpler time when the world of Minecraft felt infinite, dangerous, and unwritten. minecraft+alpha+v101602+download+install
If you own Minecraft: Java Edition, open your launcher (\rightarrow) Installations (\rightarrow) New (\rightarrow) Select "old_alpha a1.0.16_02" (\rightarrow) Play.