For the instruments I have a private plugin originally based on spleeter and I have LALAL.ai. Some tracks (like the drums) which it's not as good for, I get my buddy to extract in FL studio (its implementation is surprisingly not terrible) since I use ableton. Sometimes the result is good, sometimes it's not. There's only so much you can pull out of these old tracks but the fact we can do it at all is pretty mind-blowing.