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

ortools
5.1.4045

This version was deleted from PyPI around 2025-06-07. Installing fails with:
$ pip3 install ortools==5.1.4045 ERROR: Could not find a version that satisfies the requirement ortools==5.1.4045
View other deleted versions of ortools

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/2025-06-06/ \ ortools==5.1.4045
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Or, download files manually

And install manually via pip:
ortools-5.1.4045-cp27-cp27m-macosx_10_6_intel.whl (9.3MB)
ortools-5.1.4045-cp27-cp27m-win_amd64.whl (9.7MB)
ortools-5.1.4045-py2.7-linux-x86_64.egg (9.5MB)
ortools-5.1.4045-py2.7-macosx-10.6-intel.egg (9.4MB)
ortools-5.1.4045-py2.7-win-amd64.egg (9.7MB)
ortools-5.1.4045.win-amd64-py2.7.exe (9.9MB)