pip install CastXML
Collecting CastXML
ERROR: Could not find a version that satisfies the requirement CastXML (from versions: none)
Collecting castxml
ERROR: Could not find a version that satisfies the requirement castxml (from versions: none)
$ pip --version
pip 19.2.3 from c:\python\lib\site-packages\pip (python 3.8)

C:\Python>python.exe
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 22:45:29) [MSC v.1916 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.