You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
graphex was reported malicious
OSV:MAL-2025-6517 - Malicious code in graphex (PyPI)

graphex
3.5.8

This version was deleted from PyPI around 2025-06-18. Installing fails with:
$ pip3 install graphex==3.5.8 ERROR: Could not find a version that satisfies the requirement graphex==3.5.8
View other deleted versions of graphex

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/2025-06-17/ \ graphex==3.5.8
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Or, download files manually

And install manually via pip:
graphex-3.5.8-py3-none-any.whl (2.1MB)
graphex-3.5.8.tar.gz (2.5MB)