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

jupyterlab-ca-theme
0.3.1

This version was deleted from PyPI around 2023-10-24. Installing fails with:
$ pip3 install jupyterlab-ca-theme==0.3.1 ERROR: Could not find a version that satisfies the requirement jupyterlab-ca-theme==0.3.1
View other deleted versions of jupyterlab-ca-theme

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/2023-10-23/ \ jupyterlab-ca-theme==0.3.1
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Or, download files manually

And install manually via pip:
jupyterlab_ca_theme-0.3.1-py3-none-any.whl (48.7KB)
jupyterlab_ca_theme-0.3.1.tar.gz (34.2KB)