how to download the file when selected an option from the dropdown list. The items in the drop down list are from json file

I have json file

[
{
   "name": "Documents",
   "types": [
       {"name": "Documents1",
        "url": "http://www.google.com" },
        {"name": "Documents2",
         "url": "http://www.facebook.com" },
        ] 
},
{
    "name": "binary",
    "types": [
        {"name": "binary1",
         "link": "href=./mosq.tar.gz"
        },
        {"name": "binary2",
         "link": "href=./mosq1.tar.gz" 
        }
        ] 
 }

]

I have the html code for this

<script src="https://code.jquery.com/jquery-3.5.1.js"></script>
<html xmlns="http://www.w3.org/1999/xhtml">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-confirm/3.3.2/jquery-confirm.min.js"></script>
 <body>
 <label for="">Documents</label>
 <select id="ddlDocuments">  </select> <br>
 <label for="">Binary Download</label> 
 <select id="ddlbinary">  </select> <br>

<script type="text/javascript">
   $(document).ready(function () {

    // FETCHING DATA FROM JSON FILE
        $.getJSON("test.json",
                function (data) {
            var details = '';
         
            // ITERATING THROUGH OBJECTS
            document.getElementById("ddlDocuments").insertBefore(new Option('', ''), 
            document.getElementById("ddlDocuments").firstChild);
            $.each(data[0].types, function (key, value) {
                var option = document.createElement("OPTION");
                option.innerHTML = value.name;
                option.value = value.url;              
                ddlDocuments.options.add(option);           
            });
            $('#ddlDocuments').on('click', function () {
                var url = $(this).val(); // get selected value
                if (url) { // require a URL
                    window.open(url,'_blank');
                    // window.location = url; // redirect
                }
                 return false;
            });


            document.getElementById("ddlbinary").insertBefore(new Option('', ''), 
            document.getElementById("ddlbinary").firstChild);
            $.each(data[2].types, function (key, value) {
                var option = document.createElement("OPTION");
                option.innerHTML = value.name;
                option.value = value.link;
                ddlbinary.options.add(option);
            });

            $('#ddlbinary').on('click', function () {
                var retVal = confirm("Do you want to download ?");
                if( retVal == true ) {
                    window.location = document.getElementById('test').href;
                     return true;
                } else {
                    event.preventDefault();
                    return false;
                }
            });
        });
    });
</script>

Download

How its working right now is we get 2 dropdowns on the webpage for Documents and binary. On select of an option of binary we get a confirmation box to download or not. on click of yes it would download because i am using the div tag. But how do we download the respective file coming from the json.

It would be great if someone would help me.