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

label-studio
0.9.0rc1

This version was deleted from PyPI around 2024-01-31. Installing fails with:
$ pip3 install label-studio==0.9.0rc1 ERROR: Could not find a version that satisfies the requirement label-studio==0.9.0rc1
View other deleted versions of label-studio

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/2024-01-30/ \ label-studio==0.9.0rc1
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:
label_studio-0.9.0rc1-1-py3-none-any.whl (10.8MB)
label-studio-0.9.0rc1-1.tar.gz (10.7MB)