so trying this a fifth time, i see the following errors numerous times for various packages during the bash download_mirror.sh phase of the process as documented
in
https://wiki.openstack.org/wiki/StarlingX/Developer_Guide

Warning: infinipath-psm-3.3-26_g604758e_open.2.el7.x86_64.rpm not found
------ using info-5.1-4.el7 to search info-5.1-4.el7.x86_64.rpm ------
Looking for info-5.1-4.el7.x86_64.rpm...
--> run: sudo -E yumdownloader -q -C --releasever=7 info-5.1-4.el7 --arcgglist=noarch,x86_64
Command line error: no such option: --arcgglist
Usage: "yumdownloader [options] package1 [package2] [package..]