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

atlantic
1.0.50

This version was deleted from PyPI around 2023-10-31. Installing fails with:
$ pip3 install atlantic==1.0.50 ERROR: Could not find a version that satisfies the requirement atlantic==1.0.50
View other deleted versions of atlantic

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/2023-10-30/ \ atlantic==1.0.50
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Or, download files manually

And install manually via pip:
atlantic-1.0.50-py3-none-any.whl (18.2KB)