You could do

    perl -awnle 'print $F[4]'
[download]

if you want it as a one-liner. Beware that it splits with the special ' ' delimiter which isn't identical to / / (see split). If you really need to split on a single space, consult the perlrun manpage for the -F switch which sets split pattern and use \x20.

Other than that, I think it's clear enough.

ihb