Some of the links for the sessions are not working on Chrome. They work on Firefox and Edge, but Chrome has a security feature that is preventing the downloads from working.
This feature is designed to prevent a secure site (like https://fitzkee.chemistry.msstate.edu) from serving files from an insecure site (like http://folding.chemistry.msstate.edu). The "folding" site has a lot more space than my university-provided "fitzkee" site, but it's not encrypted. Chrome (rightly) thinks that's a red flag.
The simplest way to work around this is to view this site through Firefox or Edge. At some point, when I have more time, I'll convert "folding" over to a more modern, encrypted site. But for now, that's the best work around.
You can read a little more about this feature at the following sites. Note that they are using an older version of Chrome, so the options listed are slightly different. Note that I don't recommend disabling safe browsing (at all - seriously, please don't do this).