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

simo
2.7.21

This version was deleted from PyPI around 2025-10-30. Installing fails with:
$ pip3 install simo==2.7.21 ERROR: Could not find a version that satisfies the requirement simo==2.7.21
View other deleted versions of simo

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/2025-10-29/ \ simo==2.7.21
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:
simo-2.7.21-py3-none-any.whl (25.0MB)
simo-2.7.21.tar.gz (20.2MB)