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

arts
2024.8.20

This version was deleted from PyPI around 2024-08-26. Installing fails with:
$ pip3 install arts==2024.8.20 ERROR: Could not find a version that satisfies the requirement arts==2024.8.20
View other deleted versions of arts

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/2024-08-25/ \ arts==2024.8.20
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:
arts-2024.8.20-py3-none-any.whl (315.9KB)
arts-2024.8.20.tar.gz (230.6KB)