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

zoo-kcl
0.3.131

This version was deleted from PyPI around 2026-05-26. Installing fails with:
$ pip3 install zoo-kcl==0.3.131 ERROR: Could not find a version that satisfies the requirement zoo-kcl==0.3.131