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

kratosdelaunaymeshingapplication
9.1.2

This version was deleted from PyPI around 2024-06-26. Installing fails with:
$ pip3 install kratosdelaunaymeshingapplication==9.1.2 ERROR: Could not find a version that satisfies the requirement kratosdelaunaymeshingapplication==9.1.2