Apple has always been very picky about what it will and will not allow to happen on their hardware. And make no mistake it is their hardware. At the college we had 5 Macs all the same basic model some had the CPU running at 995 MZh and the others at 1005 MHz. We tried to update the systems to latest version of OS at the time (which I don't remember) and it worked on the 1005 machines but would not even run the installer on the 995 machines because they did not meet specs of having a 1000Mhz or greater CPU. We got around that by installing on the 1005 machines and then swapping the hard drives between machines. The 995 machines ran just fine, just a touch slower. So it wasn't something the machine was incapable of doing just that Apple did not want it to work on the slower machine so you would be forced to buy a newer Mac.

I have watched the comments about the Mac version and there are several things that needed to be changed to allow Poser to run on the newer MAcs as compared to the Windows machine. At work I have some hardware that allows laptops to be hooked into the classroom's Display system. With a PC even if the driver is slightly out of date it will still run. With the Mac it refuses to even allow the user to install the driver, even if he wanted to.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13