I have encountered the same problem and eventually found the open issues here.
My solution now is run in Ubuntu bash for windows.
However, I believe it will be wonderful if this great package also supports Windows.
@tocean
I also found this install command works.
$ pip install git+https://github.com/apple/coremltools
@b02902131 Thanks. I tried and it worked fine. But I still hope there is an official package in pypi.
Most helpful comment
@tocean
I also found this install command works.
$ pip install git+https://github.com/apple/coremltools