Hi Paul, yeah unfortunately both of those are quite difficult things.
I am making some progress on converting the UI to a system that will be more feasible to run on other operating systems, so that's a step towards that but there may be several other big steps needed as well. So I'm not sure when that will actually happen. Meanwhile it is possible to run MoI on your Mac right now using the Parallels or VMWare virtualization systems.
> but I would like a way to convert my beautiful N-gon mesh to quads.
> but if I import the mesh as a obj they are unusable
> in ZBrush for sculpting.
You can get an export for sculpting in ZBrush using some settings to divide the mesh into small pieces - also don't export using n-gons since ZBrush does not like to deal with n-gons, use "Output: Quads & Triangles" instead.
For dividing the mesh, enter a distance value in the "Divide larger than" setting to subdivide the mesh into little fragments, that can then be manipulated in ZBrush.