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

acorn
0.0.12

This version was deleted from PyPI around 2026-02-03. Installing fails with:
$ pip3 install acorn==0.0.12 ERROR: Could not find a version that satisfies the requirement acorn==0.0.12
View other deleted versions of acorn

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/2026-02-02/ \ acorn==0.0.12
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:
acorn-0.0.12-py2-none-any.whl (51.4KB)
acorn-0.0.12.tar.gz (37.0KB)