You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
fiinquant was reported malicious
OSV:MAL-2025-41672 - Malicious code in fiinquant (PyPI)

fiinquant
0.9.1

This version was deleted from PyPI around 2025-04-01. Installing fails with:
$ pip3 install fiinquant==0.9.1 ERROR: Could not find a version that satisfies the requirement fiinquant==0.9.1
View other deleted versions of fiinquant

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/2025-03-31/ \ fiinquant==0.9.1
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Or, download files manually

And install manually via pip:
FiinQuant-0.9.1-py3-none-any.whl (31.0KB)
fiinquant-0.9.1.tar.gz (27.9KB)