I noticed at the Kunena forum that someone asked for the file com_fbconverter_v1.0.5RC2_b159_2008-07-15.zip in order to first upgrade an old version of
Fireboard (which only runs on J! 1.0 or J! 1.5 in legacy mode).
I am attaching the file here for those people who may also be interested in the
migration service that I provide
.