you can download for free from here but only one  map at a time. I'd like to
get quite a number of them so leeching would be good but I can't get httrack
to do it.

If anyone can show me how to do it with httrack or any other way it'd be
great. 

from here:
<https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/46413>