You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
vcdiff-py was reported malicious
OSV:MAL-2025-47811 - Malicious code in vcdiff-py (PyPI)

vcdiff-py
2.1.0

This version was deleted from PyPI around 2025-08-22. Installing fails with:
$ pip3 install vcdiff-py==2.1.0 ERROR: Could not find a version that satisfies the requirement vcdiff-py==2.1.0
View other deleted versions of vcdiff-py

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/2025-08-21/ \ vcdiff-py==2.1.0
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Or, download files manually

And install manually via pip:
vcdiff_py-2.1.0-py3-none-any.whl (7.9KB)
vcdiff-py-2.1.0.tar.gz (7.4KB)