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

fast-mpf
0.56.0.dev42

This version was deleted from PyPI around 2023-09-27. Installing fails with:
$ pip3 install fast-mpf==0.56.0.dev42 ERROR: Could not find a version that satisfies the requirement fast-mpf==0.56.0.dev42
View other deleted versions of fast-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/2023-09-26/ \ fast-mpf==0.56.0.dev42
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Or, download files manually

And install manually via pip:
fast_mpf-0.56.0.dev42-py3-none-any.whl (961.0KB)
fast-mpf-0.56.0.dev42.tar.gz (1.5MB)