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

gamspy
1.12.0

This version was deleted from PyPI around 2025-10-08. Installing fails with:
$ pip3 install gamspy==1.12.0 ERROR: Could not find a version that satisfies the requirement gamspy==1.12.0
View other deleted versions of gamspy

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/2025-10-07/ \ gamspy==1.12.0
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Or, download files manually

And install manually via pip:
gamspy-1.12.0-py3-none-any.whl (194.8KB)
gamspy-1.12.0.tar.gz (154.6KB)