I have two python installations on Windows (3.4 and 3.5) where py refers to 3.4.
I installed nuitka using their 3.4 64 bit installer and then I installed Python 2.7 because it was listed as a requirement.
Then I tried:
> py -m nuitka
And got the error:
C:\Python34\python.exe: No module named nuitka.__main__; 'nuitka' is a package and cannot be directly executed
Nuitka can be accessed through its batch file in Python's script folder. For example:
"C:\Python34\Scripts\nuitka.bat" --version
> 0.5.18