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

atlassian-helios
0.0.25.dev4

This version was deleted from PyPI around 2023-10-20. Installing fails with:
$ pip3 install atlassian-helios==0.0.25.dev4 ERROR: Could not find a version that satisfies the requirement atlassian-helios==0.0.25.dev4
View other deleted versions of atlassian-helios

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/2023-10-19/ \ atlassian-helios==0.0.25.dev4
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Or, download files manually

And install manually via pip:
atlassian-helios-0.0.25.dev4.tar.gz (1.3KB)