Not sure if this is the right place to ask and report, because the situation is quite unusual, but since I cannot open a new thread I post here.
I managed to install and run successfully SpaceEngine on a Mac! Well, not exactly, but it runs under VMware. Here is the exact configuration and the problems.
The Mac is an 27" iMac 2019 equipped with a Core i5-9600K and Radeon Pro Vega 48, running under macOS 10.14 (Mojave). I have a Windows 10 virtual machine running through VMware Fusion 11 in an external SSD. So I installed SpaceEngine 0.9.7.1 on it and to my big surprise it opened without crashing! And it runs very fluidly without lag. The same experience on a Macbook Pro failed and I guess the Intel Iris integrated graphics are responsible for this.
Now, while SpaceEngine 0.9.7.1 runs on that virtual machine, it has some glitches here and there. I noticed that some objects (e.g. the Sun, Pluto, etc.) do not appear from near as they should but they appear as transparent spheres. So only the delimiting circle is visible and we can see the stars behind. Is the virtual environment the reason for this or is it a known issue with this version?
I also tried SpaceEngine 0.9.8.0 but no luck. It gives a flickering screen and crashes hard the virtual machine (freezing in the process the whole macOS interface). Fortunately VMware proposes after some time to reboot Windows 10 and the system returns back to normal without rebooting the iMac.