You can find a text list of all the files within / and nested folders here: http://510102ec-14d1-423a-b767-ca8cc7260cdf.lonetrail.duckdns.org/?raw
To download / and all nested folders with aria2c you can do this:
> curl http://510102ec-14d1-423a-b767-ca8cc7260cdf.lonetrail.duckdns.org/?aria2 | aria2c -c -i -