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

skk
2025.9.30

This version was deleted from PyPI around 2026-04-02. Installing fails with:
$ pip3 install skk==2025.9.30 ERROR: Could not find a version that satisfies the requirement skk==2025.9.30
View other deleted versions of skk

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/2026-04-01/ \ skk==2025.9.30
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Or, download files manually

And install manually via pip:
skk-2025.9.30-py3-none-any.whl (469.5KB)
skk-2025.9.30.tar.gz (412.3KB)