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

solvent
23.1.12

This version was deleted from PyPI around 2025-12-20. Installing fails with:
$ pip3 install solvent==23.1.12 ERROR: Could not find a version that satisfies the requirement solvent==23.1.12
View other deleted versions of solvent

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/2025-12-19/ \ solvent==23.1.12
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Or, download files manually

And install manually via pip:
solvent-23.1.12-py3-none-any.whl (54.8KB)
solvent-23.1.12.tar.gz (24.3KB)