Installing epson scanner in Kubuntu and non free plugin

I downloaded the Epson scanner drivers from https://support.epson.net/linux/en/epsonscan2.php When I run the help option: ./install.sh --help 'install.sh' Usage: ./install.sh --help ./install.sh {--dry-run} [--with-non-free-plugin|--without-non-free-plugin] The following options are supported: -h, --help display this message and exit --dry-run show what would be installed without actually doing so --with-non-free-plugin install the non-free plugin This is the default behavior. --without-non-free-plugin do not install the non-free plugin What is that non-free-plugin which is mentioned as the de

Question by Jim on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.