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

birder
0.0.6a21

This version was deleted from PyPI around 2025-04-24. Installing fails with:
$ pip3 install birder==0.0.6a21 ERROR: Could not find a version that satisfies the requirement birder==0.0.6a21
View other deleted versions of birder

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/2025-04-23/ \ birder==0.0.6a21
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:
birder-0.0.6a21-py3-none-any.whl (561.8KB)
birder-0.0.6a21.tar.gz (371.0KB)