@tig said:

I think you must assume there will be no more development.
It's been dormant since 2013 !
😞

You might want to check out BoolTools 2. It's not free but it's Mac compatible and very powerful. There is even a discount on currently.

Designed with 3D Printing in mind, BooTools 2 outperforms the SketchUp solid tools in nearly every way. Even works with nested solids!