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

spatialstudio
1.1.0.0.6

This version was deleted from PyPI around 2025-06-21. Installing fails with:
$ pip3 install spatialstudio==1.1.0.0.6 ERROR: Could not find a version that satisfies the requirement spatialstudio==1.1.0.0.6