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

robotpy-halsim-gui
2023.0.0b7.post1

This version was deleted from PyPI around 2025-05-21. Installing fails with:
$ pip3 install robotpy-halsim-gui==2023.0.0b7.post1 ERROR: Could not find a version that satisfies the requirement robotpy-halsim-gui==2023.0.0b7.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/2025-05-20/ \ robotpy-halsim-gui==2023.0.0b7.post1
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