I tried the Torrent link directly in Firefox, Kget (from KDE) came up and complained a wrong format.
Then I downloaded the torrent file and opened it on another PC, it failed too.
A64olinuxino_ubuntu_16.04.3_20171110.torrent
It seems that source and destination point to a folder on my PC.
How can I get an A64 image?
You can get it via FTP here: ftp://staging.olimex.com/Allwinner_Images/a64-olinuxino/linux/