Where to find fieldtrip_simbio.m ? (To learn ft_prepare_sourcemodel and ft_prepare_leadfield)

Trying to work out how to create sourcemodel and leadfield for source analyses in FieldTrip.
This paper mentions an example script name fieldtrip_simbio.m in it’s Additional Files section, with a link back to the article itself. Can’t seem to locate the file.
Thanks for any pointers!