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

mzcst-2024
2025.5.22.2244

This version was deleted from PyPI around 2025-06-26. Installing fails with:
$ pip3 install mzcst-2024==2025.5.22.2244 ERROR: Could not find a version that satisfies the requirement mzcst-2024==2025.5.22.2244
View other deleted versions of mzcst-2024

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2025-06-25/ \ mzcst-2024==2025.5.22.2244
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)

Or, download files manually

And install manually via pip:
mzcst_2024-2025.5.22.2244-py3-none-any.whl (50.1KB)
mzcst_2024-2025.5.22.2244.tar.gz (36.4KB)