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

nabu
2021.1.0rc0

This version was deleted from PyPI around 2025-07-09. Installing fails with:
$ pip3 install nabu==2021.1.0rc0 ERROR: Could not find a version that satisfies the requirement nabu==2021.1.0rc0
View other deleted versions of nabu

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/2025-07-08/ \ nabu==2021.1.0rc0
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:
nabu-2021.1.0rc0-py3-none-any.whl (270.6KB)
nabu-2021.1.0rc0.tar.gz (206.9KB)