I'm using the real launcher
I already have Forge installed
Okay! This is easy.
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Ensure that the Minecraft Launcher is closed
Run the LiteLoader installer, you will be see the following screen
If your .minecraft directory is not shown in the selection box, then click the … button and browse to the correct location
In the Extend from box, select the version of Minecraft Forge you want to use
Click OK to run the installation
Next question: Do you want to use any other tweaks? (eg. Optifine or ShadersMod)