You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
mecit3 was reported malicious
OSV:MAL-2024-10044 - Malicious code in mecit3 (PyPI)

mecit3

This package was deleted from PyPI around 2024-09-17. Installing fails with:
$ pip3 install mecit3 ERROR: Could not find a version that satisfies the requirement mecit3 (from versions: none) ERROR: No matching distribution found for mecit3

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pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2024-09-16/ \ mecit3
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Or, download files manually

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1.0.0