This computer (a spare notebook, fortunately) is now without a VPN, because when Pamac alerted me that I should update ExpressVPN, the update failed. Because this was an AUR, and they often have dependency issues, I uninstalled ExpressVPN and tried for a fresh install of the latest version instead of an update. Bad idea! Turns out, the software server site the package in the AUR repository is trying to download from (“https://www.expressvpn.works/clients/linux/expressvpn_3.37.0.2-1_amd64.deb”) apparently no longer exists.
It’s not just that one file, either; it’s the entire domain. plugging “https://www.expressvpn.works/” into Firefox yields “domain not found”.
I don’t know how to contact whoever maintains that package, but they need to update the domain in their package to the correct domain. (If there is one. There should be. Unless ExpressVPN just went bankrupt or something.)