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

ortools
1.3853

This version was deleted from PyPI around 2025-06-07. Installing fails with:
$ pip3 install ortools==1.3853 ERROR: Could not find a version that satisfies the requirement ortools==1.3853
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==1.3853
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)

Or, download files manually

And install manually via pip:
ortools-1.3853-py2.7-linux-x86_64.egg (7.9MB)
ortools-1.3853-py2.7-macosx-10.9-intel.egg (5.1MB)
ortools-1.3853-py2.7-win-amd64.egg (7.5MB)
ortools-1.3853-py2.7-win32.egg (6.1MB)
ortools-1.3853.win-amd64-py2.7.exe (7.6MB)
ortools-1.3853.win32-py2.7.exe (6.2MB)