[ffooky]

Open a torrent, double click it in the "My Torrents" pane and then select the Files tab once the details pane has loaded. If you just want one track, click the top file and then shift-click the bottom so all are highlighted. Right click in the priority column and select "Do not download" Unhighlight the files and then right click in the priority column of the one file you do want, selecting "High priority". If you want several tracks, click and then cmd-click subsequent tracks until all the ones you do want are highlighted before right clicking in the priority column as above.