Read the detailed installation instructions.
Quick installation instructions: 1. get the file grass-5.7.0-DD-MM-YYYY-arch-bin.tar.gz 2. get the installation script grass-5.7.0-DD-MM-YYYY-arch-install.sh For installation, run the install script with --help option: grass-5.7.0-DD-MM-YYYY-arch-install.sh --help
Get this file.