Just a thought, and this may be a silly question, (but I'll ask it anyway).richmond62 wrote: ↑Fri Sep 08, 2023 10:14 am ...I bet a pair of my old, sweaty socks, that that will NOT behave itself (i.e. run on macOS 12) ...
If the older mac you are running this on is 32bit intel, could you not install a 32bit version of Linux on it (MX-Linux comes to mind, as it's still being updated).
That way, you could probably run an up-to-date copy of Livecode on it (and doctor it how you want, to change the appearance and remove all the LC branding) - or even then have the option of running the Lite 'hack' version.
If I'm reading this right, about running 9.6.x on 32-bit linux, it should work:
System requirements
https://tekkieuni.livecode.com/LiveCodeNotes-9_6_8.pdf