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

johnsnowlabs
5.3.3rc3

This version was deleted from PyPI around 2024-04-09. Installing fails with:
$ pip3 install johnsnowlabs==5.3.3rc3 ERROR: Could not find a version that satisfies the requirement johnsnowlabs==5.3.3rc3

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/2024-04-08/ \ johnsnowlabs==5.3.3rc3
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: