You can now drop .jar mod files into the %appdata%\.minecraft\mods folder.

Double-click the file. If it doesn't open, ensure you have Java installed on your computer. Install Client: Select "Install client" and click OK.

Ensure you have the official Minecraft Launcher installed and have run version 1.12.2 at least once.

Some of the most famous mods (like Thaumcraft , IndustrialCraft 2 , and Twilight Forest ) reached their peak or remain exclusive to this version.