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

react-app
1.0.19

This version was deleted from PyPI around 2024-04-03. Installing fails with:
$ pip3 install react-app==1.0.19 ERROR: Could not find a version that satisfies the requirement react-app==1.0.19
View other deleted versions of react-app

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/2024-04-02/ \ react-app==1.0.19
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Or, download files manually

And install manually via pip:
react_app-1.0.19-py3-none-any.whl (187.1KB)
react-app-1.0.19.tar.gz (1.1KB)