I don't recall. The file (of the same name) was definitely still there in the download directory but I didn't open Transmission first. I clicked the torrent link on the Jaunty download page and that launched Transmission (with a dialog to add the torrent).
For Alpha 6 I left the files and Transmission in the prior state (Alpha 5) and fired up Transmission. Both torrents in Transmission were highlighted in red and said \"Requested download is not authorized for use with this tracker - idle\".
That also jogged my memory. For Alpha 3 -> Alpha 4 experiment I now remember having three torrents, the two new Alpha 4 torrents and one in red (the Alpha 3 with both the old torrent and the old Alpha 3 jaunty-desktop-amd64.iso file. I now remember deleting that \"dead\" torrent but leaving the old iso file, which after download was complete didn't pass the checksum. 781b155fdc