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

openctp-ctp
6.6.1.3

This version was deleted from PyPI around 2024-08-16. Installing fails with:
$ pip3 install openctp-ctp==6.6.1.3 ERROR: Could not find a version that satisfies the requirement openctp-ctp==6.6.1.3