I downloaded one but I don’t know how to use it in blender.
If you placed it in the scripts-folder of your bleder-installation, you could acces it trhough the scripts-window.
If it’s somewhere else on your PC, you could open it trough the text-editor, and press alt-p to execute it.
For more info, you should see the docs.
Go into the Preferences Menus - File Locations - Python scripts. Make sure this points to where the scripts are in your Blender Installation.
Then don’t forget to save Default Settings or you’ll have to do this every time you run Blender.
you can also load it in the text editor and run it by pressing altp or “execute script” from the menu or right click context menu