Mods/Installing OptiForge/Manual Install/With Pre-made JSON

Step 0.
First you must find your .minecraft directory directory. This directory will not exist if you have not run the minecraft launcher at least once. This tutorial will work from within this folder.

Linux (bash): mkdir -p ~/.minecraft && cd ~/.minecraft

Step 1.
Create a new folder in the "versions" directory called "1.6.2 OptiForge 2013.07.17". You can name this folder anything you want, and the name you choose will be the name of your Minecraft version.

Step 2.
Create a new text file inside the folder you just created and name it "1.6.2 OptiForge 2013.07.17.json". Note the extension is important. Then copy the contents of the block below and paste it into that file, and save.

Windows: By default, windows systems do not show extensions so you will either need to enable file name extensions, or open Wordpad and paste the code into there and enter the correct file name when you save.