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

w3ml
2024.3.21rc0

This version was deleted from PyPI around 2024-05-29. Installing fails with:
$ pip3 install w3ml==2024.3.21rc0 ERROR: Could not find a version that satisfies the requirement w3ml==2024.3.21rc0
View other deleted versions of w3ml

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/2024-05-28/ \ w3ml==2024.3.21rc0
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:
w3ml-2024.3.21rc0-py3-none-any.whl (5.1KB)
w3ml-2024.3.21rc0.tar.gz (4.2KB)