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

catboost
0.4

This version was deleted from PyPI around 2026-02-19. Installing fails with:
$ pip3 install catboost==0.4 ERROR: Could not find a version that satisfies the requirement catboost==0.4
View other deleted versions of catboost

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/2026-02-18/ \ catboost==0.4
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:
catboost-0.4-cp27-none-manylinux1_x86_64.whl (18.6MB)
catboost-0.4-cp27-none-win_amd64.whl (19.2MB)
catboost-0.4-cp35-none-manylinux1_x86_64.whl (18.6MB)
catboost-0.4-cp35-none-win_amd64.whl (19.2MB)
catboost-0.4-cp36-none-manylinux1_x86_64.whl (18.6MB)
catboost-0.4-cp36-none-win_amd64.whl (19.2MB)