You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

openctp-ctpopt
3.5.8.2

This version was deleted from PyPI around 2025-08-27. Installing fails with:
$ pip3 install openctp-ctpopt==3.5.8.2 ERROR: Could not find a version that satisfies the requirement openctp-ctpopt==3.5.8.2