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

core-base
1.0.5

This version was deleted from PyPI around 2023-12-27. Installing fails with:
$ pip3 install core-base==1.0.5 ERROR: Could not find a version that satisfies the requirement core-base==1.0.5
View other deleted versions of core-base

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/2023-12-25/ \ core-base==1.0.5
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Or, download files manually

And install manually via pip:
core_base-1.0.5-py3-none-any.whl (256.1KB)
core_base-1.0.5.tar.gz (110.6KB)