sagemath-standard
9.3rc2
This version was deleted from PyPI around 2025-02-12. Installing fails with:
$ pip3 install sagemath-standard==9.3rc2
ERROR: Could not find a version that satisfies the requirement sagemath-standard==9.3rc2

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/2025-02-11/ \
sagemath-standard==9.3rc2
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)