Unfortunately the MacOS platform is becoming increasingly onerous to work with, due to Apple's continuously increasing and changing demands. Security is one such change: those of you who have installed Isaac on Macs with Mojave know that the Isaac install process is no longer just simple double-click. There are now new Apple security windows that, if not properly managed by the user, will result in Isaac crashing. We have provided precise instructions about how to deal with Apple's security changes, but we know that if users don't follow our instructions exactly, then bad things will happen...
On top of the security changes, the new MacOS Catalina is coming next month. Some of you may have seen warnings on your Mac that Isaac Mac is not optimized for 64 bit. Apple says that 64 bit software runs faster and we're sure that it is true. However, what this warning means that Isaac Mac 4.1.1, our most current release, will not run at all on Catalina. That is infinitely slower than right now...

We are struggling with how to proceed. Updating Isaac Mac for Catalina requires fundamental changes our software, including finding and replacing 32 bit libraries that currently are not available in 64 bit. It also requires updating and recompiling our entire code.
And even if we can manage to find the 64 bit libraries, we believe we will still be hamstrung by Apple security restrictions--restrictions that we believe will become even more onerous in Catalina.
So, upgrading Isaac Mac for Catalina, if possible, will be expensive, and we are not certain we can get around the security issues in a friendly, simple, Apple-like manner.
We are sorely tempted to abandon the Mac platform. If we did so, Mac users running Catalina could still access Isaac, but in Isaac Windows form, through Parallels or VM Fusion. In fact, we've already updated Isaac Windows to 5.0.1, and it works just fine.
We would appreciate your comments.