You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
pykooler was reported malicious
OSV:MAL-2023-8579 - Malicious code in pykooler (PyPI)

pykooler
1.0.0

This version was deleted from PyPI around 2023-09-24. Installing fails with:
$ pip3 install pykooler==1.0.0 ERROR: Could not find a version that satisfies the requirement pykooler==1.0.0
View other deleted versions of pykooler

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/2023-09-23/ \ pykooler==1.0.0
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)

Or, download files manually

And install manually via pip:
pykooler-1.0.0.tar.gz (2.5KB)