4.0 is only an Amiga-emulator that maybe could be fun. but nahh. I bought 4.1FE to use on my CSPPC. booted it like twice. once to show a friend..
we want 3.x sources so we can do some changes and patches so we can use our beloved amigas some more. phew.. well.. sadly this is how Amiga has been the last.. 20 years.