Hi Oliver.
Wmmmmm... So strange.
I tried again just after read your reply.
I succeeded to download "xz80q.zip" file, and "sorter.exe" works fine!
Just 2 days ago, I tried iota site from http and ftp.
Ftp show no "xz80q.zip" file on that site....

But all problems are cleared.
Bill, please forget my mail.

Masaki Kouda, Japan