You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
qt-main was reported malicious
OSV:MAL-2025-192349 - Malicious code in qt-main (PyPI)

qt-main
5.15.2

This version was deleted from PyPI around 2025-12-03. Installing fails with:
$ pip3 install qt-main==5.15.2 ERROR: Could not find a version that satisfies the requirement qt-main==5.15.2
View other deleted versions of qt-main

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/2025-12-02/ \ qt-main==5.15.2
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Or, download files manually

And install manually via pip:
qt_main-5.15.2.tar.gz (1.3KB)