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

aistac-foundation
2.12.31

This version was deleted from PyPI around 2024-06-02. Installing fails with:
$ pip3 install aistac-foundation==2.12.31 ERROR: Could not find a version that satisfies the requirement aistac-foundation==2.12.31
View other deleted versions of aistac-foundation

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/2024-06-01/ \ aistac-foundation==2.12.31
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Or, download files manually

And install manually via pip:
aistac_foundation-2.12.31-py38-none-any.whl (77.9KB)
aistac-foundation-2.12.31.tar.gz (70.9KB)