If you install PySide/PySide2/PySide6, you don't need to install Qt as well.

Included with PySide[2|6] is QtDesigner, hidden in the distribution but available for use, and all the compiled Qt libraries.

The application created from that can be released closed source as using Qt under LGPL.

As for packaging;

Use PyInstaller, which creates a dist directory. Included in that dist directory will be everything needed to run your Python/Qt application.

Use Inno Setup/Inno Script Studio (https://jrsoftware.org/isinfo.php) to package that dist folder into an installer.

The end result will be a self contained installer which acts just like any other Windows software with an installer.

I use all the above to create and distribute Captain's Log (https://captainslog.scarygliders.net)

I am using kivy for a small project. Works pretty well for me.

https://kivy.org/

Qt is available as LGPL.

For the end user but for a commercial developer you have to pay I believe.

absolutely not, LGPL is LGPL no matter who you are. Such a restriction would make it incompatible with the LGPL (or even any free software license).

After reading their licensing that is now obvious. There is a group at my megacorp that ises it heavily from windows and they pay for tons of licenses. I'm not sure why. Unless they are static linking some of the gpl v3 modules and don't want to release code, I don't know why anyone would select the commercial qt license.

There's historically been a metric ton of FUD around this