I have several Mac-using students who reported the issue below when trying to download the Stock & Watson data files. Maybe this is similar to the issue I had on Windows last week?
Thanks for the report, Peter, but I don't think it's the same thing as you mentioned before. The "cURL timeout" would just seem to indicate a (presumably intermittent) problem with the sourceforge server. All the same, I'll look into it myself the next time I boot into macOS.