javascript console:
to_fetch = []; $('.machine_names').each(function(i, item) { var u = $(item).attr('href'); if (u.match('rar$')) { to_fetch.push(window.location.origin + "/" + u) } }); console.log(JSON.stringify(to_fetch))

shell:
jq -r '.[]' < 'kb6.json' | vipe | ( while read u; do wget --continue --no-glob "$u"; sleep 60; done )