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

spack
0.4

This version was deleted from PyPI around 2025-06-07. Installing fails with:
$ pip3 install spack==0.4 ERROR: Could not find a version that satisfies the requirement spack==0.4
View other deleted versions of spack

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/2025-06-06/ \ spack==0.4
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:
spack-0.4.linux-x86_64.tar.gz (17.3KB)
spack-0.4.tar.gz (18.1KB)