I got back from the airport in the middle of the night and started downloading the 4 big X2 installation files. It was soon zipping along and looking like it would be all done in just over an hour, so I went to bed. This morning thay had all stalled, 2 were almost done. The Wireless router had "locked up". Once I had rebooted the router "Downthemall" attempted to resume, but something had timed out.
I will start again when I get back from work, this time I will use a cable connection.