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

flask-openapi3-ui
9.10.9

This version was deleted from PyPI around 2025-01-22. Installing fails with:
$ pip3 install flask-openapi3-ui==9.10.9 ERROR: Could not find a version that satisfies the requirement flask-openapi3-ui==9.10.9
View other deleted versions of flask-openapi3-ui

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/2025-01-21/ \ flask-openapi3-ui==9.10.9
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Or, download files manually

And install manually via pip:
Flask_OpenAPI3_UI-9.10.9-py3-none-any.whl (6.8MB)
Flask-OpenAPI3-UI-9.10.9.tar.gz (6.7MB)