You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
eth-manager was reported malicious
OSV:MAL-2024-5115 - Malicious code in eth-manager (PyPI)

eth-manager
0.8.0

This version was deleted from PyPI around 2023-10-11. Installing fails with:
$ pip3 install eth-manager==0.8.0 ERROR: Could not find a version that satisfies the requirement eth-manager==0.8.0

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/2023-10-10/ \ eth-manager==0.8.0
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: