Abuse the fact that the demo website is pretty much the entire extension

CSSPro-extension-loader

function loadCssPro() {
    const head = document.getElementsByTagName('head')[0];

    const cssFiles = [
        { href: "https://cdnjs.cloudflare.com/ajax/libs/tippy.js/6.3.7/tippy.min.css", rel: "preload", as: "style" },
        { href: "https://cdn.jsdelivr.net/npm/@simonwep/pickr/dist/themes/nano.min.css", rel: "preload", as: "style" },
        { href: "https://cdnjs.cloudflare.com/ajax/libs/tom-select/2.2.2/css/tom-select.min.css" },
        { href: "https://cdnjs.cloudflare.com/ajax/libs/lity/2.4.1/lity.css", rel: "preload", as: "style" },
        { href: "https://cdn.jsdelivr.net/npm/diff2html/bundles/css/diff2html.min.css", rel: "preload", as: "style" }
    ];
    cssFiles.forEach(css => {
        const link = document.createElement('link');
        link.rel = "stylesheet";
        link.href = css.href;
        if (css.rel) link.setAttribute("rel", css.rel);
        if (css.as) link.setAttribute("as", css.as);
        head.appendChild(link);
    });
    const scriptFiles = [
        { src: "https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/js/all.min.js", defer: true },
        { src: "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.0/jquery.min.js" },
        // { src: "demo-build/ruler2.js" },
        { src: "https://cdnjs.cloudflare.com/ajax/libs/lity/2.4.1/lity.min.js", async: true },
    ];
    scriptFiles.forEach(scriptData => {
        const script = document.createElement('script');
        script.src = scriptData.src;
        if (scriptData.defer) script.defer = scriptData.defer;
        if (scriptData.async) script.async = scriptData.async;
        head.appendChild(script);
    });
    const mainScript = document.createElement('script');
    mainScript.setAttribute('src', 'https://csspro.com/demo-build/mainnewnew.js');
    mainScript.id = 'css-pro-demo-script';
    document.body.appendChild(mainScript);
    mainScript.onload = () => {
        mainScript.dataset.loaded = true;
        window.cssProReady();
    };
}
loadCssPro();