The SignWriting Image Server you downloaded does not include all of the
font software. You'll need to download one or more of the SVG fonts.
You can find them online:
There are 5 SVG fonts to choose from for the ISWA 2010: 1) Refinement,
2) Line Trace, 3) Shadow Trace, 4) Smooth, and 5) Angular. Download the
desired zip files. Each is just under 30 MB. Put it in the
"swis2/iswa" subdirectory and unzip.
The default is the SVG Refinement: svg1. This is a work in progress and
is not yet completed.
The svg2 - svg5 have been completed and are stable. The SVG Line Trace
(svg2) is my favorite. You'll need to use "style=svg2" to access it.