Go to the official Fabric website and download the installer for your OS. Run it and select the Minecraft version you want (e.g., 1.21).
This is why the keyword grouping makes so much sense. You can install one Meteor version and, with ViaFabric, access nearly any server across that entire spectrum. Meteor Client 1.21- 1.20.6 -- 1.16.5
Meteor Client’s currently run 1.16.5 – 1.20.4 (as of mid-2025). Versions 1.20.5, 1.20.6, and 1.21 are often available via dev builds or community forks (e.g., “Meteor-fork for 1.21”). Go to the official Fabric website and download