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

mcs
0.3.4

This version was deleted from PyPI around 2024-04-21. Installing fails with:
$ pip3 install mcs==0.3.4 ERROR: Could not find a version that satisfies the requirement mcs==0.3.4
View other deleted versions of mcs

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/2024-04-20/ \ mcs==0.3.4
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:
mcs-0.3.4-py2.7.egg (13.2KB)
mcs-0.3.4.zip (11.3KB)