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

misp-stix
20241220

This version was deleted from PyPI around 2025-01-13. Installing fails with:
$ pip3 install misp-stix==20241220 ERROR: Could not find a version that satisfies the requirement misp-stix==20241220
View other deleted versions of misp-stix

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/2025-01-12/ \ misp-stix==20241220
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)

Or, download files manually

And install manually via pip:
misp_stix-20241220-py3-none-any.whl (41.1MB)
misp_stix-20241220.tar.gz (22.0MB)