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

basepair
2.0.12rc0

This version was deleted from PyPI around 2024-02-12. Installing fails with:
$ pip3 install basepair==2.0.12rc0 ERROR: Could not find a version that satisfies the requirement basepair==2.0.12rc0
View other deleted versions of basepair

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/2024-02-11/ \ basepair==2.0.12rc0
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Or, download files manually

And install manually via pip:
basepair-2.0.12rc0-py3-none-any.whl (65.2KB)
basepair-2.0.12rc0.tar.gz (46.5KB)