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

coalpy
0.54

This version was deleted from PyPI around 2024-08-05. Installing fails with:
$ pip3 install coalpy==0.54 ERROR: Could not find a version that satisfies the requirement coalpy==0.54
View other deleted versions of coalpy

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/2024-08-04/ \ coalpy==0.54
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Or, download files manually

And install manually via pip:
coalpy-0.54-py3-none-any.whl (29.7MB)
coalpy-0.54.tar.gz (29.6MB)