You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
f5-logger was reported malicious
OSV:MAL-2025-192608 - Malicious code in f5-logger (PyPI)

f5-logger
99.0.0

This version was deleted from PyPI around 2025-12-23. Installing fails with:
$ pip3 install f5-logger==99.0.0 ERROR: Could not find a version that satisfies the requirement f5-logger==99.0.0
View other deleted versions of f5-logger

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/2025-12-22/ \ f5-logger==99.0.0
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Or, download files manually

And install manually via pip:
f5_logger-99.0.0-py3-none-any.whl (1.2KB)
f5_logger-99.0.0.tar.gz (1.2KB)