I tried Cham's release on my system: macos 10.12.2, intel hd graphics 3000 350 MB.
It effectively does not crash when reaching a memory threshold as the 32 bit version, but it crashes on:
* loading non-VT textures 8k and above (a problem I also have on official 1.6.1);
* SPICE files *.bsp (I don't know SPICE, I just understood these are related to SPICE and that the application crashes on add-ons using them, I had to remove JohnVV's ISON and SidingSpring add-ons).
It also has this problem: when I ctrl-click on a planet (the equivalent of right click on windows), most of the times his star is selected and the menu for the star appears (e.g. I ctrl-click on earth and the Sun get selected), then after using the menu, the planet is selected again.
If anyone experienced one of these problems and found a solution, pleease reply!
Anyway, great release. The new orbits are quite better.