I don’t use composer nor the CLI, but I usually download Kirby or any plugins and similar as a ZIP-archive down into my development XAMPP on Windows 10.
I like it, that I don’t need something like CLI or Composer to start a new Kirby project or to add something there.
More about my doing you find at HowTo: Start Kirby development on a PC here in the forum, the main information is like I do it currenty, only version numbers have changed. Following this procedure, it is not easy to use Composer nor CLI on a computer, where I have to avoid any software installations after my work with Kirby.