To run this in the Twitch launcher, click F12 or click the top "☰" menu, navigate to "Window" -> "Toggle Contents Developer Tools", then in the bottom console entry, paste the following text to inject the script into the running page:

(function(d, script) {
    script = d.createElement('script');
    script.type = 'text/javascript';
    script.async = true;
    script.onload = function(){
        // remote script has loaded
    };
    script.src = 'https://openuserjs.org/install/Kirneh/Auto_Claim_Twitch_Channel_Bonus_Points.min.js';
    d.getElementsByTagName('head')[0].appendChild(script);
}(document));