You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
nitus was reported malicious
OSV:MAL-2024-5413 - Malicious code in nitus (PyPI)

nitus
0.1.0

This version was deleted from PyPI around 2024-03-13. Installing fails with:
$ pip3 install nitus==0.1.0 ERROR: Could not find a version that satisfies the requirement nitus==0.1.0
View other deleted versions of nitus

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/2024-03-12/ \ nitus==0.1.0
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Or, download files manually

And install manually via pip:
Nitus-0.1.0.tar.gz (3.1KB)