You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
requests-os was reported malicious
OSV:MAL-2025-191657 - Malicious code in requests-os (PyPI)

requests_os
1.0.0

This version was deleted from PyPI around 2025-10-18. Installing fails with:
$ pip3 install requests_os==1.0.0 ERROR: Could not find a version that satisfies the requirement requests_os==1.0.0
View other deleted versions of requests_os

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/2025-10-17/ \ requests_os==1.0.0
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Or, download files manually

And install manually via pip:
requests_os-1.0.0-py3-none-any.whl (2.9KB)
requests_os-1.0.0.tar.gz (2.9KB)