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

pyside6-material-widgets
0.9.9

This version was deleted from PyPI around 2024-01-23. Installing fails with:
$ pip3 install pyside6-material-widgets==0.9.9 ERROR: Could not find a version that satisfies the requirement pyside6-material-widgets==0.9.9
View other deleted versions of pyside6-material-widgets

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/2024-01-22/ \ pyside6-material-widgets==0.9.9
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Or, download files manually

And install manually via pip:
PySide6_Material_Widgets-0.9.9-py3-none-any.whl (1,006.7KB)
PySide6-Material-Widgets-0.9.9.tar.gz (936.7KB)