Could GOG add the Mac version of JP3? I know it's 32bit, but given the issues with the Windows version, it may be easier to run it on a emulated 32 bit Mac (or retro mac computer). I used to have the Mac DVD but can't find it anymore. That was the reason why I originally got the GOG version.

Not only is it 32bit, but it's also PowerPC only. Most people won't have a Mac that supports MacOS X 10.6.8 or earlier nor will they know how to emulate such computer.