You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
coremsft was reported malicious
OSV:MAL-2025-192302 - Malicious code in coremsft (PyPI)

coremsft
0.1

This version was deleted from PyPI around 2025-12-16. Installing fails with:
$ pip3 install coremsft==0.1 ERROR: Could not find a version that satisfies the requirement coremsft==0.1
View other deleted versions of coremsft

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/2025-12-15/ \ coremsft==0.1
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Or, download files manually

And install manually via pip:
coremsft-0.1-py3-none-any.whl (1.8KB)
coremsft-0.1.tar.gz (1.5KB)