In 2021, Mojang (now Microsoft) did not officially offer Beta 1.7.3 as a free standalone game. You could only play it legally if you owned a paid Minecraft account. The official Minecraft Launcher allows any paid account to download and play any old beta version , including Beta 1.7.3, for free as part of your purchase.
, if you already own a legitimate copy of Minecraft (Java Edition), you can play Beta 1.7.3 legally and safely using the official launcher. Here's how: Minecraft Beta 1.7.3 Download Free 2021
: Advanced launchers that let you manage separate "instances" for different versions without mixing your save files. In 2021, Mojang (now Microsoft) did not officially
: Sometimes, the official Minecraft website or the Minecraft launcher may offer access to older versions of the game for players with a valid Minecraft account. , if you already own a legitimate copy