All the links to the archlinux version of the Itch.io app installer appear to be pointing to a page that's currently broken. Are there links to a backup version (or even a not-quite-latest version)?
Which link is it pointing to? We don’t manage the ArchLinux AUR package. We recommend getting the app from https://itch.io/app, even for Linux.
The app auto-updates, and you should always use the latest version. Older versions may be blacklisted from communicating with our API to force people to update. The app ships with Electron and updates are necessary for security patches.