Use fetch.sh
to grab the WARCC-file (https://archive.org/download/yahoo-groups-2017-09-03T05-35-21Z-4c3880/macromediadirector_group.RmKlqJY.warc.gz)
Run repair-mbox.py
with new outputed as argument to fix the mailbox to useable mailbox for importing into Thunderbird:
python3 repair-mbox.py macromediadirector_group.RmKlqJY.mbox