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

jupyterlab
4.0.0a37

This version was deleted from PyPI around 2024-10-14. Installing fails with:
$ pip3 install jupyterlab==4.0.0a37 ERROR: Could not find a version that satisfies the requirement jupyterlab==4.0.0a37
View other deleted versions of jupyterlab

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/2024-10-13/ \ jupyterlab==4.0.0a37
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:
jupyterlab-4.0.0a37-py3-none-any.whl (84.1MB)
jupyterlab-4.0.0a37.tar.gz (92.1MB)