User gets as far as
https://cdimage.debian.org/cdimage/weekly-builds/
whereupon entering
https://cdimage.debian.org/cdimage/weekly-builds/amd64/
he sees a "bd" not explained where CD and DVD were earlier.

He must check https://www.google.com/search?q=cd+dvd+bd
to finally guess what "bd" means.

I downloaded Blu-ray (https://cdimage.debian.org/debian-cd/current/amd64/jigdo-bd/debian-12.7.0-amd64-BD) images of all five disks and added them to sources.list, I tried to apt install cherrytree, but I couldn't do it because the dependencies libxml++2.6-2v5_2.40.1-3_amd64.deb and libgtksourceviewmm-3.0-0v5_3.18.0-4+b1_amd64.deb are missing. I had to install them separately.