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What you just downloaded installs and updates plugins and themes from public repositories and there's no license key needed if all your code is public.
If your theme or plugin code lives in a private repository, you'll need a license. A license also gets you email support from the people (me!) who maintain the plugin. $99/year covers 5 client sites, $199 covers 20, $499 covers 100. What a license covers, in full.
Try it for thirty days and if you're not happy, get a full refund, with no questions asked. If you would rather point the free version at a public repo first to see whether the workflow suits you, that works too! It's the same plugin either way.
In this short video I'm going to show you how easy it is to get started with WP Pusher
I'll show you how to install a plugin from GitHub, but the process would be almost the same for Bitbucket or GitLab.
Enjoy!