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

arc-alkali-rydberg-calculator
3.1.0

This version was deleted from PyPI around 2024-05-20. Installing fails with:
$ pip3 install arc-alkali-rydberg-calculator==3.1.0 ERROR: Could not find a version that satisfies the requirement arc-alkali-rydberg-calculator==3.1.0
View other deleted versions of arc-alkali-rydberg-calculator

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/2024-05-19/ \ arc-alkali-rydberg-calculator==3.1.0
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Or, download files manually

And install manually via pip:
ARC-Alkali-Rydberg-Calculator-3.1.0.tar.gz (25.3MB)