I think url = '%s/T%d.expansion.html' % (content_url, t_num) should now just be url = '%s/T%d' % (content_url, t_num) for high-wire source.
I think
url = '%s/T%d.expansion.html' % (content_url, t_num)
should now just be
url = '%s/T%d' % (content_url, t_num)
for high-wire source.