Sadly, its been since I first downloaded the proxmox ISO - including the CT containers, and any updates...
$ host -a download.proxmox.com
Trying "download.proxmox.com"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63219
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 6...