Adding my 2 cents here - stopped working for me as well a few days ago. Both the workflow and the download page aren't working. Trying to curl results in:
❯❯❯ curl http://units.dnsu.ch/download -vvv
* Trying 195.238.74.50...
* TCP_NODELAY set
* Connected to units.dnsu.ch (195.238.74.50) port 80 (#0)
> GET /download HTTP/1.1
> Host: units.dnsu.ch
> User-Agent: curl/7.54.0
> Accept: */*
>
* Recv failure: Connection reset by peer
* stopped the pause stream!
* Closing connection 0
curl: (56) Recv failure: Connection reset by peer
Maybe it'll help somehow.