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

coolbox
0.4.0

This version was deleted from PyPI around 2026-06-08. Installing fails with:
$ pip3 install coolbox==0.4.0 ERROR: Could not find a version that satisfies the requirement coolbox==0.4.0
View other deleted versions of coolbox

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/2026-06-07/ \ coolbox==0.4.0
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:
coolbox-0.4.0-py3-none-any.whl (119.5KB)
coolbox-0.4.0.tar.gz (98.6KB)