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

at1-compression
0.1.0

This version was deleted from PyPI around 2026-06-18. Installing fails with:
$ pip3 install at1-compression==0.1.0 ERROR: Could not find a version that satisfies the requirement at1-compression==0.1.0
View other deleted versions of at1-compression

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/2026-06-17/ \ at1-compression==0.1.0
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Or, download files manually

And install manually via pip:
at1_compression-0.1.0-py3-none-any.whl (145.7KB)
at1_compression-0.1.0.tar.gz (125.7KB)