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

factorycore-utils
4.1.15

This version was deleted from PyPI around 2023-10-30. Installing fails with:
$ pip3 install factorycore-utils==4.1.15 ERROR: Could not find a version that satisfies the requirement factorycore-utils==4.1.15
View other deleted versions of factorycore-utils

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/2023-10-29/ \ factorycore-utils==4.1.15
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Or, download files manually

And install manually via pip:
factorycore_utils-4.1.15-py2.py3-none-any.whl (20.1KB)