My guess is that the likely user take-up doesn't justify the effort to adapt CQ100 to other operating systems.
Like it or not, we are stuck with Windows.
Although now nearly 20,00 people have registered, you wouldn't think so to listen to CQ100. I imagine that so many folk, particularly those with the minimal licenses, i.e.code-less ones, just register for the sake of it and duck out as soon as the novelty wears off and/or the 90 day free period, runs out.
Pity, because the program has much to offer to those prepared to put a little effort into it. But maybe that is the way these days - easy come, easy go.