Hi campbelljc. Thanks for asking! I'd forgotten that Mac OS was going to phase out 32-bit soon. I rewrote much of Pixel Fireplace to a new code base last year, but there are a lot of extra features I need to finish like dual-monitor support. I'm busy on another project, so maybe what I'll do is finish up the essential stuff and add that alongside the other builds as a 64-bit-Alpha option.