What you posted only shows a failed download probably because abf-downloads.org was down. So we need to see the other errors to help. Unless it’s this
When abf-downloads.org is down you can use a mirror. Currently to do that you need to manually edit repos or temporarily enable the mirror. See the post by @mandian here. Or go to the beginning of that thread for how to edit the repos.
I think the geniuses are close to having MirrorManager ready for Lx 4 but they are keeping it a secret.