Tracker gave an error: "Torrent not found" Debian stretch alpha 7

[Rick Thomas <rbthomas@pobox.com>]

I tried to bit torrent download using the torrent file
    http://cdimage.debian.org/cdimage/stretch_di_alpha7/amd64/bt-cd/debian-mac-stretch-DI-alpha7-amd64-netinst.iso.torrent
but I get the error message  <<Tracker gave an error: "Torrent not found”>> from Transmission.

Any idea what’s up?

Thanks!
Rick