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

slimgui
0.0.1.post1

This version was deleted from PyPI around 2025-03-11. Installing fails with:
$ pip3 install slimgui==0.0.1.post1 ERROR: Could not find a version that satisfies the requirement slimgui==0.0.1.post1

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/2025-03-10/ \ slimgui==0.0.1.post1
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)