Hello,
Sorry if I missed mails with this subject.
Why do you want to install TDE on an old Debian ?
(computer too old ?).
Because with a SSD hard disk, Linux can work fine,
even if the computer is old, not so slow,
and Debian-Bookworm will accept the last TDE version.
Old cars are better than new ones, including mine,
and also my old Dell computer too.
Why to change them !
:-)