there's now:
cat=7
from=1
to=18
cookie="steal from browser"
for page in $(seq $from $to)
do echo CAT "https://share.allegorithmic.com/libraries?by_category_type_id=$cat&page=$page" >&2
curl "https://share.allegorithmic.com/libraries?by_category_type_id=$cat&page=$page" | \
grep -Eo 'a href="/libraries/[0-9]+"><div class="asset-top' | \
grep -Eo 'libraries/[0-9]+'
done | while read item
do cat > /dev/shm/sbd.curlcfg <<END
-L
-H "dnt: 1"
-H "accept-encoding: gzip, deflate, br"
-H "accept-language: en-US,en;q=0.9,de;q=0.8"
-H "user-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.170 Safari/537.36"
-H "accept: text/html, application/xhtml+xml, application/xml"
-H "referer: https://share.allegorithmic.com/$item/download_file"
-H "authority: share.allegorithmic.com"
-H "cookie: _allegorithmic-substance-marketplace_session=$cookie"
-H "x-xhr-referer: https://share.allegorithmic.com/$item/download_file"
--compressed
END
filename="$(curl "https://share.allegorithmic.com/$item" -K /dev/shm/sbd.curlcfg | \
grep -Eo '<div class="col-md-5 text-muted text-right"><p>.*File Name: .*?<br />' | \
sed 's/.*File Name: //;s/<br.*//')"
loc="$(curl -K /dev/shm/sbd.curlcfg "https://share.allegorithmic.com/$item/download_file" | sed 's/.*href="//;s/".*//;s/amp;//g')"
echo FILE $filename $loc >&2
curl "$loc" -K /dev/shm/sbd.curlcfg -o "$filename"
done