I intend to address this soon - Mac builds were recently changed in GMS2 to produce 64-bit binaries (and use 64-bit extensions as result), but I've not yet managed to get the extension to work with that (primarily due to being overloaded with other tasks as-is). If there's a sense of urgency and you know your way around the basics of compiling with gcc+/g++, send me an email from your purchase address and with your order reference (find it here), and I'll send you the source code + current build files to try things out with.