Just make sure that you are connected to Tor. The options at the end are optional, but can be helpful as Tor can be unreliable.

curl -O --socks5-hostname localhost:9050 'http://bianlianlbc5an4kgnay3opdemgcryg2kpfcbgczopmm3dnbz3uaunad.onion/' --retry 999 --retry-max-time 0 -C