Need help with jQuery

Need help with jQuery

I'm new with jQuery and Javascript.
I had downloaded the jQuery v3.4.1 to my PC in same folder with .html page.
I'm traying to embedd jQuery in .html page with <script> but it doesnt work.
When i load/reload the page the alert() outputs "jQuery not installed".
Hope someone can help me here.
  1. <html>
  2. <head>
           <script src="jquery.min.js"></script>
  3. </head>

        <body>
            <div id="body-wrapper">

                    <script>
                             if (typeof jQuery == "undefined") { 
                                    alert("jQuery is not installed");
                             } else {
                                    alert("jQuery is installed");
                             }
                    </script>
           
           
            </div>
        </body>

    </html>