Comment 69 for bug 293940

the .py file should be usable as it is. But the .inx file is new and you may need to modify it. If you are running a development version of Inkscape, you can use it directly, if you are running Inkscape 0.46 stable version then replace the first two lines :
<?xml version="1.0" encoding="UTF-8"?>
<inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">

with the single line :
<inkscape-extension>

hth,
Alvin