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

this-system
0.0.0

This version was deleted from PyPI around 2024-02-01. Installing fails with:
$ pip3 install this-system==0.0.0 ERROR: Could not find a version that satisfies the requirement this-system==0.0.0
View other deleted versions of this-system

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/2024-01-31/ \ this-system==0.0.0
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Or, download files manually

And install manually via pip:
this_system-0.0.0-py3-none-any.whl (15.0KB)
this_system-0.0.0.tar.gz (14.7KB)