It seems the FBX file provided in the wiki does not load into Blender. It is something to do with the Blender FBX importer.
Avastar has a new test version out that has the new avatar collision bones. It is version: avastar-1-1-905_blender-2-64.zip. If you have purchased Avastar, you can download and install the test version using your download URL. AFAIK, there is no raw file up yet. Gaia found a problem and corrected it. But, the fix is not official yet. There is a JIRA bug report: FITMESH-2.
If you don’t have Avastar, you may be able to use the FBX converter provided by AutoDesk to convert to a format that works. I haven’t completed testing alternate paths yet.
At Oz Linden’s Open Source Meeting he said Redpoly is working on creating a Collada file (.DAE)