Executing the command python -m pip install -U OpenCC will install OpenCC v1.1.1, but not the latest stable version 1.1.2.
After investigating the output of pip with a --verbose flag appended, it seems the problem originates from that pip tried to query https://pypi.org/simple/opencc/ for compatible wheel, ending up finding no compatible wheel for both Windows platform and v1.1.2.
I don't know what needs to be done to fix this, having no experience in writing and publishing C-extension Python library. Maybe we need to manually create and publish new wheel files?