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

gekko
0.1rc9

This version was deleted from PyPI around 2025-04-03. Installing fails with:
$ pip3 install gekko==0.1rc9 ERROR: Could not find a version that satisfies the requirement gekko==0.1rc9
View other deleted versions of gekko

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/2025-04-02/ \ gekko==0.1rc9
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Or, download files manually

And install manually via pip:
gekko-0.1rc9-py3-none-any.whl (8.9MB)
gekko-0.1rc9.tar.gz (8.8MB)