This link is only relevant for the old version 6 plugin.
The technique for generating a list of figures is much simpler using the new DITA support in TopLeaf, and is in fact included in the sample DITA/book stylesheet.
The current XMetaL plugin can be downloaded from http://www.turnkey.com.au/tksweb/Downloads/XMTP.exe
. Information on working with the stylesheet is available from the "getting started" page and also in the TopLeaf documentation. If you require assistance you can contact firstname.lastname@example.org.