Cython Error During Package Load

I get this error when trying to install pdfservices-SDK.  

File "C:\Users\User\AppData\Local\Temp\pip-build-env-nwavifvl\overlay\Lib\site-packages\setuptools\_distutils\cmd.py", line 107, in __getattr__
raise AttributeError(attr)
AttributeError: cython_sources
[end of output]

note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

× Getting requirements to build wheel did not run successfully.
│ exit code: 1
╰─> See above for output.