Just to say I have now unpacked the tar.gz thanks to help from the list.
I installed wget (from mirrors.kernel.org), and ran the command:
wget http://mailtools.anomy.net/dist/anomy-sanitizer-1.56.tar.gz
to copy the tar.gz directly to the server.
I also checked the 1.55 version and found that the one that had come via
http:// to client then (binary) ftp to server had lost 3 bytes in the
process.
Thanks again, Oliver Tickell