If you want a nostalgic experience, use the "Historical Versions" setting in the official Minecraft Launcher to play legitimate versions like Alpha 1.0.16 or earlier.
The earliest stages were known as Pre-classic (Rd-versions). Classic: The first major public phase. alpha minecraft 000 new
Look for reputable "ARG" or "Lost Media" communities on Reddit to see if a specific file is a known creative project. If you want a nostalgic experience, use the