As indicated by #109, current releases of Gridsync can fail to run on older Mac hardware for varying reasons (due, most commonly, perhaps, to bundled libraries having been compiled with processor-specific optimizations). While some workarounds are already in place to support older macs (e.g., build scripts to recompile libsodium and downgrade PyQt/SIP), these fixes are only available to those who build Gridsync from source. Accordingly, the next release of Gridsync should either a) distribute signed binaries that will run on older Mac hardware or b) distribute two versions of Gridsync for macOS users: one for those using newer hardware (and who are running the a version of macOS supported by the latest version of Qt) and one for those using older hardware.