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

multioptpy
1.21.1

This version was deleted from PyPI around 2026-05-05. Installing fails with:
$ pip3 install multioptpy==1.21.1 ERROR: Could not find a version that satisfies the requirement multioptpy==1.21.1
View other deleted versions of multioptpy

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/2026-05-04/ \ multioptpy==1.21.1
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:
multioptpy-1.21.1-py3-none-any.whl (848.5KB)
multioptpy-1.21.1.tar.gz (714.0KB)