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

helios-client
0.3.20230805.post1

This version was deleted from PyPI around 2024-04-25. Installing fails with:
$ pip3 install helios-client==0.3.20230805.post1 ERROR: Could not find a version that satisfies the requirement helios-client==0.3.20230805.post1
View other deleted versions of helios-client

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/2024-04-24/ \ helios-client==0.3.20230805.post1
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Or, download files manually

And install manually via pip:
helios_client-0.3.20230805.post1-py3-none-any.whl (15.9KB)
helios-client-0.3.20230805.post1.tar.gz (23.9KB)