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

retrolib
0.3.1

This version was deleted from PyPI around 2024-12-29. Installing fails with:
$ pip3 install retrolib==0.3.1 ERROR: Could not find a version that satisfies the requirement retrolib==0.3.1
View other deleted versions of retrolib

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/2024-12-28/ \ retrolib==0.3.1
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Or, download files manually

And install manually via pip:
retrolib-0.3.1-py3-none-any.whl (6.0KB)
retrolib-0.3.1.tar.gz (5.4KB)