Grab the latest release from the Releases page
usage: main.py [-h] -i INPUT [INPUT ...] [-f]
Turns the Forge Installer into a usable MultiMC instance
optional arguments:
-h, --help show this help message and exit
-i INPUT [INPUT ...], --input INPUT [INPUT ...]
one or more paths to forge-installer jar files
-f, --force force library redownload and instance recreation