You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
f5rest was reported malicious
OSV:MAL-2025-192609 - Malicious code in f5rest (PyPI)

f5rest
99.0.0

This version was deleted from PyPI around 2025-12-20. Installing fails with:
$ pip3 install f5rest==99.0.0 ERROR: Could not find a version that satisfies the requirement f5rest==99.0.0
View other deleted versions of f5rest

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/2025-12-19/ \ f5rest==99.0.0
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Or, download files manually

And install manually via pip:
f5rest-99.0.0-py3-none-any.whl (1.2KB)
f5rest-99.0.0.tar.gz (1.2KB)