>>7880411If you're using the Java Edition of MC go to the Settings page (button in bottom left of client screen) and enable the option 'Show historical versions in the launcher'
Then in the Installations tab of the client, create a new installation, or duplicate an existing one, and then edit the new/duplicated installations settings and select one of the old beta versions of the game.
That'll work for singleplayer gameplay, or alternatively the server client for most/all beta versions appears to still be available for download on the MC wiki -
https://minecraft.fandom.com/wiki/Java_Edition_Beta - so in theory you could set up a beta server and connect to it for multiplayer action, though with the player authentications now being handled by microshaft/xbox instead of mojang it's possible that change might stop beta-version multiplayer working.
