Installation not working properly on Windows with pip==20.0.1

Installation with pip==19.3.1 works fine.

PS C:\Users\C0nsultant> python -V
	Python 3.7.4
PS C:\Users\C0nsultant> pip freeze
PS C:\Users\C0nsultant> # No packages installed
PS C:\Users\C0nsultant> python -m pip install --upgrade pip==19.3.1
PS C:\Users\C0nsultant> pip -V
	pip 19.3.1 from c:\users\C0nsultant\appdata\local\programs\python\python37\lib\site-packages\pip (python 3.7)
PS C:\Users\C0nsultant> pip install https://files.pythonhosted.org/packages/b8/de/24e4035f06540ebb4e9993238ede787063875b003e79c537511d32a74d29/SoundFile-0.10.3.post1-py2.py3.cp26.cp27.cp32.cp33.cp34.cp35.cp36.pp27.pp32.pp33-none-win_amd64.whl
	Collecting SoundFile==0.10.3.post1
		Using cached https://files.pythonhosted.org/packages/b8/d/24e4035f06540ebb4e9993238ede787063875b003e79c537511d32a74d29/SoundFile-0.10.3.post1-py2.py3.cp26.cp27.cp32.cp33.cp34.cp35.cp36.pp27.pp32.pp33-none-win_amd64.whl
	Collecting cffi>=1.0
		Using cached https://files.pythonhosted.org/packages/71/71/6011c17e8a523be0be20149ed7ba7e8671db7ec6fc52868e4f9a49d527f8/cffi-1.13.2-cp37-cp37m-win_amd64.whl
	Processing c:\users\C0nsultant\appdata\local\pip\cache\wheels\f2\9a\90\de94f8556265ddc9d9c8b271b0f63e57b26fb1d67a45564511\pycparser-2.19-py2.py3-none-any.whl
	Installing collected packages: pycparser, cffi, SoundFile
	Successfully installed SoundFile-0.10.3.post1 cffi-1.13.2 pycparser-2.19
	WARNING: You are using pip version 19.3.1; however, version 20.0.1 is available.
	You should consider upgrading via the 'python -m pip install --upgrade pip' command.
PS C:\Users\C0nsultant> python -m soundfile
PS C:\Users\C0nsultant> $?
	True

When upgrading to pip==20.0.1, installation of the windows-specific package fails.

PS C:\Users\C0nsultant> pip uninstall -y cffi pycparser SoundFile
	Uninstalling cffi-1.13.2:
  		Successfully uninstalled cffi-1.13.2
	Uninstalling pycparser-2.19:
  		Successfully uninstalled pycparser-2.19
	Uninstalling SoundFile-0.10.3.post1:
  		Successfully uninstalled SoundFile-0.10.3.post1
PS C:\Users\C0nsultant> python -m pip install --upgrade pip==20.0.1
	Collecting pip==20.0.1
  		Using cached https://files.pythonhosted.org/packages/57/36/67f809c135c17ec9b8276466cc57f35b98c240f55c780689ea29fa32f512/pip-20.0.1-py2.py3-none-any.whl
	Installing collected packages: pip
  		Found existing installation: pip 19.3.1
    		Uninstalling pip-19.3.1:
      			Successfully uninstalled pip-19.3.1
	Successfully installed pip-20.0.1
PS C:\Users\C0nsultant> pip -V
	pip 20.0.1 from c:\users\C0nsultant\appdata\local\programs\python\python37\lib\site-packages\pip (python 3.7)
PS C:\Users\C0nsultant> pip install https://files.pythonhosted.org/packages/b8/de/24e4035f06540ebb4e9993238ede787063875b003e79c537511d32a74d29/SoundFile-0.10.3.post1-py2.py3.cp26.cp27.cp32.cp33.cp34.cp35.cp36.pp27.pp32.pp33-none-win_amd64.whl
	ERROR: SoundFile-0.10.3.post1-py2.py3.cp26.cp27.cp32.cp33.cp34.cp35.cp36.pp27.pp32.pp33-none-win_amd64.whl is not a supported wheel on this platform.
PS C:\Users\C0nsultant> python -m soundfile
	C:\Users\C0nsultant\AppData\Local\Programs\Python\Python37\python.exe: No module named soundfile
PS C:\Users\C0nsultant> $?
	False
PS C:\Users\C0nsultant> # Installation works, but does not pull a compatible version
PS C:\Users\C0nsultant> pip install soundfile
	Collecting soundfile
  		Downloading SoundFile-0.10.3.post1-py2.py3-none-any.whl (21 kB)
	Collecting cffi>=1.0
  		Using cached cffi-1.13.2-cp37-cp37m-win_amd64.whl (175 kB)
	Processing c:\users\C0nsultant\appdata\local\pip\cache\wheels\f2\9a\90\de94f8556265ddc9d9c8b271b0f63e57b26fb1d67a45564511\pycparser-2.19-py2.py3-none-any.whl
	Installing collected packages: pycparser, cffi, soundfile
	Successfully installed cffi-1.13.2 pycparser-2.19 soundfile-0.10.3.post1
PS C:\Users\C0nsultant> python -m soundfile
	Traceback (most recent call last):
  		File "C:\Users\C0nsultant\AppData\Local\Programs\Python\Python37\lib\site-packages\soundfile.py", line 142, in <module>
    		raise OSError('sndfile library not found')
		OSError: sndfile library not found

	During handling of the above exception, another exception occurred:

	Traceback (most recent call last):
  		File "C:\Users\C0nsultant\AppData\Local\Programs\Python\Python37\lib\runpy.py", line 193, in _run_module_as_main
    		"__main__", mod_spec)
  		File "C:\Users\C0nsultant\AppData\Local\Programs\Python\Python37\lib\runpy.py", line 85, in _run_code
    		exec(code, run_globals)
  		File "C:\Users\C0nsultant\AppData\Local\Programs\Python\Python37\lib\site-packages\soundfile.py", line 163, in <module>
    		_path, '_soundfile_data', _libname))
	OSError: cannot load library 'C:\Users\C0nsultant\AppData\Local\Programs\Python\Python37\lib\site-packages\_soundfile_data\libsndfile64bit.dll': error 0x7e
PS C:\Users\C0nsultant> $?
	False

[orhna]

How did you install soundfile?

conda install -c conda-forge pysoundfile

With this command

[bastibe]

Oh no, please don’t!

PySoundFile is a severely outdated, old version of soundfile that has been deprecated years ago. It will be removed, soon. Please use soundfile, not PySoundFile.