You will have to install the plugin manually using the following:

1)  ./install-gnome.sh

This will modify ${HOME}/.config/Thunar/uca.xml

2) You will also need to edit /etc/pacpl/pacpl.conf and change ZEN_DIR & ZEN_OPTS to 1
   and make sure KDE_DIR & KDE_OPTS = 0

Note: this version can be used with the kde plugin on any system that
supports multiple desktop choices (Slackware for example) if need be. 
You will just need to replace PACPL-Converter by PACPL-Konverter in
your ${HOME}/.config/Thunar/uca.xml
and do the exact opposite of the step 2) above.

Restart Thunar (if already open) to see the changes take effect.
