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

test-uqpy
4.0.0

This version was deleted from PyPI around 2023-10-10. Installing fails with:
$ pip3 install test-uqpy==4.0.0 ERROR: Could not find a version that satisfies the requirement test-uqpy==4.0.0
View other deleted versions of test-uqpy

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/2023-10-09/ \ test-uqpy==4.0.0
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Or, download files manually

And install manually via pip:
test_uqpy-4.0.0-py3-none-any.whl (257.1KB)
test_uqpy-4.0.0.tar.gz (146.2KB)