Hi Darryl,
I can send you the ISO files for 7.1 and 7.2, as I got the approval from the Product Owner. I will let you know the download path by separate Mail. The reason why you can't download it anymore is the End of Service Announcements for CA Plex Releases 7.1 and 7.2 (EOS in Janaury 2019). Rather than make them available for download again, we will post them if requested.
regards
Thomas