This is just and example for an arbitrary Arch Linux iso, always check for latest version and best mirror for you in https://www.archlinux.org/download/ or on the website of your distribution of choice.
curl http://br.mirror.archlinux-br.org/iso/2020.09.01/archlinux-2020.09.01-x86_64.iso -o archlinux-2020.09.01-x86_64.iso -#