You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
mrmustard was reported malicious
OSV:MAL-2026-11049 - Malicious code in mrmustard (PyPI)

mrmustard

This package was deleted from PyPI around 2026-07-24. Installing fails with:
$ pip3 install mrmustard ERROR: Could not find a version that satisfies the requirement mrmustard (from versions: none) ERROR: No matching distribution found for mrmustard

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pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2026-07-23/ \ mrmustard
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Or, download files manually

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0.1.0
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0.6.1.post1
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1.0.0a1