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

gs-apps
0.26.0a20231116

This version was deleted from PyPI around 2023-11-20. Installing fails with:
$ pip3 install gs-apps==0.26.0a20231116 ERROR: Could not find a version that satisfies the requirement gs-apps==0.26.0a20231116
View other deleted versions of gs-apps

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/2023-11-19/ \ gs-apps==0.26.0a20231116
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:
gs_apps-0.26.0a20231116-py2.py3-none-macosx_12_0_x86_64.whl (43.9MB)
gs_apps-0.26.0a20231116-py2.py3-none-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (44.6MB)