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

niopub
0.1.6

This version was deleted from PyPI around 2025-06-05. Installing fails with:
$ pip3 install niopub==0.1.6 ERROR: Could not find a version that satisfies the requirement niopub==0.1.6
View other deleted versions of niopub

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/2025-06-04/ \ niopub==0.1.6
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Or, download files manually

And install manually via pip:
niopub-0.1.6-py3-none-any.whl (50.2KB)
niopub-0.1.6.tar.gz (51.7KB)