First of all, boot your Arch Linux live CD.
You'll need an internet connection to use this script, if you need to use Wi-Fi type iw dev
to find your Wi-Fi interface name and then wifi-menu -o INTERFACE_NAME
to connect.
Then, download the script and run it:
loadkeys br-abnt2
pacman -Sy git --noconfirm
git clone https://github.com/telmotrooper/tali
tali/install.py