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

pyspex
1.4.16

This version was deleted from PyPI around 2025-02-22. Installing fails with:
$ pip3 install pyspex==1.4.16 ERROR: Could not find a version that satisfies the requirement pyspex==1.4.16
View other deleted versions of pyspex

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/2025-02-21/ \ pyspex==1.4.16
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Or, download files manually

And install manually via pip:
pyspex-1.4.16-py3-none-any.whl (681.1KB)
pyspex-1.4.16.tar.gz (699.1KB)