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

mtmtrain
0.3.259

This version was deleted from PyPI around 2024-08-25. Installing fails with:
$ pip3 install mtmtrain==0.3.259 ERROR: Could not find a version that satisfies the requirement mtmtrain==0.3.259
View other deleted versions of mtmtrain

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/2024-08-24/ \ mtmtrain==0.3.259
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Or, download files manually

And install manually via pip:
mtmtrain-0.3.259-py3-none-any.whl (43.2MB)
mtmtrain-0.3.259.tar.gz (43.1MB)