You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
python-sdkcore was reported malicious
OSV:MAL-2024-5787 - Malicious code in python-sdkcore (PyPI)

python-sdkcore
1.0.4

This version was deleted from PyPI around 2023-11-07. Installing fails with:
$ pip3 install python-sdkcore==1.0.4 ERROR: Could not find a version that satisfies the requirement python-sdkcore==1.0.4
View other deleted versions of python-sdkcore

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/2023-11-06/ \ python-sdkcore==1.0.4
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Or, download files manually

And install manually via pip:
python-sdkcore-1.0.4.tar.gz (9.7KB)