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

exciton
1.0.16

This version was deleted from PyPI around 2024-04-13. Installing fails with:
$ pip3 install exciton==1.0.16 ERROR: Could not find a version that satisfies the requirement exciton==1.0.16
View other deleted versions of exciton

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/2024-04-12/ \ exciton==1.0.16
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Or, download files manually

And install manually via pip:
exciton-1.0.16-py3-none-any.whl (8.9KB)