Some comments:

• One usually pulls a use foo statement outside a subroutine.
• You just want to say

  sub wanted {
    return if $_ eq '.' or $_ eq '..';
    # matching /\./ might throw way too much
    push( @dirlist, $File::Find::name )
      if -d $File::Find::name;
    # use push instead,
    # only if we are dealing with a directory
  }
  [download]

• The only reason why I can think that it would not recurse automatically would be if E: is a samba-mounted shared directory, in which case you have to futz around with $dont_use_nlink (some name like that, I forget, but it's in the documentation).