Our 3D CAD supplier models have been moved to 3Dfindit.com, the new visual search engine for 3D CAD, CAE & BIM models.
You can log in there with your existing account of this site.
The content remains free of charge.
Under "$CADENAS_DATA/23d-libs" in the respective project directory the needed *.pra files for the example are found.
Detailed information on the creation of *.pra files can be found under Section 5.5.2, “Import DWG/DXF files and convert them into .pra format”.