The share data files are available as a magnet torrent download. It's about 8GB in size, due to the street map data. A limited download without streetmap data will be released shortly.
It is recommended that you continue to share the torrent, and you can have the pay chess client access the live (expanded) files in place. You can set the uplink throttle on your torrent program to a slow rate, if you are concerned about bandwidth usage. These files include street maps, chess piece data in both 2d image and 3d model form, and background images, plus more.
You can use rtorrent (command line), or btpd to download files. Also uTorrent and Transmission can follow magnet links like the one above.
Once you have the data files in place, you can download the Pay Chess client to run the program.