Okay, so I apologize for this but this is technically a second thread about almost the same topic.
The first one is here:
However, I've opened this one because it's a different problem, and I thought I had done it correctly in order to get to the step in the previous thread, but I was wrong.
The guide at: http://connie.slackware.com/~alien/multilib/
Asks to use "lftp -c ... ... ..." and for my mirror I chose:
Leading me to use this:
lftp -c 'open http://slackware.com/~alien/multilib/ ; http://connie.slackware.com/~alien/multilib/13.37/
However, after doing so this is what is returned:
Did I do something wrong?