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

mpf
0.50.4

This version was deleted from PyPI around 2023-11-05. Installing fails with:
$ pip3 install mpf==0.50.4 ERROR: Could not find a version that satisfies the requirement mpf==0.50.4
View other deleted versions of mpf

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/2023-11-04/ \ mpf==0.50.4
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:
mpf-0.50.4-cp34-none-any.whl (1.0MB)
mpf-0.50.4.tar.gz (787.3KB)