Given all the water that's flowed under the bridge thus far, I doubt a fully functional OctaMED for OS4 will ever see the light of day.
Even if it does, most of us bedroom music producers gave up waiting on it years ago and moved to something else.
Don't get me wrong, I'd probably still buy a copy but more out of curiosity and nostalgia than any real likelihood of using it to produce music. I've been using other tools on other platforms for that for well over a decade now.