The Internode Mirror contains a wide selection of software for download by Internode customers.
File Download Mirror Directory Listing
Index of /pub/linux/debian/dists/oldstable/main/installer-amd64/20210731+deb11u12/images/netboot/gtk/debian-installer/
Index of /pub/linux/debian/dists/oldstable/main/installer-amd64/20210731+deb11u12/images/netboot/gtk/debian-installer/