Just a FYI, the MacOS version fails with a "can't be opened" error. This is not the "unidentified developer" error. I have checked and permissions appear correct so fixing it with chmod doesn't address it.
So.... the windows version of RPGMZ doesn't build the Mac version too well.
I've prepared a new one, built natively on a Mac I borrowed.
I've replaced the one here, and you can also download from:
https://mega.nz/file/XmAF1bbI#xOMf0Hfmg7mR_CH1kLPGvXNwbFcySt5uUt3v4VSxYp8