axel just reverts to --help output (no error message)

[ringofyre]

$ axel http://dl1.upfdl.com/files/Serial/new/Sweetbitter/S01/Sweetbitter.S01E02.720p.WEB.HEVC.x265.RMT.Farda.DL.mkv
Usage: axel [options] url1 [url2] [url...]

--max-speed=x -s x Specify maximum speed (bytes per second)
--num-connections=x -n x Specify maximum number of connections
--output=f -o f Specify local output file
--search[=x] -S [x] Search for mirrors and download from x servers
--header=x -H x Add header string
--user-agent=x -U x Set user agent
--no-proxy -N Just don't use any proxy server
--insecure -k Don't verify the SSL certificate
--quiet -q Leave stdout alone
--verbose -v More status information
--alternate -a Alternate progress indicator
--help -h This information
--version -V Version information

Visit https://github.com/eribertomota/axel/issues to report bugs

alias is axel -n 10 -cva, still doesn't work with alias disabled - can't even get -V output

$ uname -a
Linux Pavillion 4.9.0-9-amd64 #1 SMP Debian 4.9.168-1+deb9u3 (2019-06-16) x86_64 GNU/Linux

wget gets files.

[ismaell]

That's an old version, looks like v2.13.1; try updating it.

[ismaell]

Not happening on 2.17; but the server is returning a 500 error code.