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

webcoreframe
2023.9.5.post8

This version was deleted from PyPI around 2024-01-10. Installing fails with:
$ pip3 install webcoreframe==2023.9.5.post8 ERROR: Could not find a version that satisfies the requirement webcoreframe==2023.9.5.post8

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/2024-01-09/ \ webcoreframe==2023.9.5.post8
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: