You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

rfs-v4
4.0.1

This version was deleted from PyPI around 2025-08-25. Installing fails with:
$ pip3 install rfs-v4==4.0.1 ERROR: Could not find a version that satisfies the requirement rfs-v4==4.0.1
View other deleted versions of rfs-v4

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/2025-08-24/ \ rfs-v4==4.0.1
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:
rfs_v4-4.0.1-py3-none-any.whl (198.1KB)
rfs_v4-4.0.1.tar.gz (170.1KB)