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

casm
0.1a1

This version was deleted from PyPI around 2023-12-12. Installing fails with:
$ pip3 install casm==0.1a1 ERROR: Could not find a version that satisfies the requirement casm==0.1a1
View other deleted versions of casm

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/2023-12-11/ \ casm==0.1a1
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:
casm-0.1a1-py2.py3-none-any.whl (10.5KB)
casm-0.1a1.tar.gz (9.8KB)