Download Word Document Template using JavaScript in Model Driven App/Dynamics 365

// pass PrimaryControl as CrmParameter for formContext parameter
//pass PrimaryEntityTypeCode as CrmParameter for entityTypeCode parameter
function DownloadDocumentTemplate(formContext, entityTypeCode) {
    //display notification
    Xrm.Utility.showProgressIndicator("Downloading");
    var filename = "Save As File Name.docx" /*the template will be downloaded and saved with this name. Replace this with the desired file name*/
    var templateType = 9940;
    var Query = "?$select=documenttemplateid&$filter=name eq 'My Document Template'"; /*This is the name of the Word Document Template available in the CRM which is to be downloaded. Replace it accordingly*/
    var id = formContext.data.entity.getId();
    var globalContext = Xrm.Utility.getGlobalContext();
    var path = globalContext.getClientUrl() + "/_grid/print/print_data.aspx";
    //query template record based name
    Xrm.WebApi.online.retrieveMultipleRecords("documenttemplate", Query).then(
        function success(results) {
            if (results.entities.length > 0) {
                var wordTemplateId = results.entities[0]["documenttemplateid"];
                var request = "exportType=MergeWordTemplate&selectedRecords=%5B%22" + id + "%22%5D&associatedentitytypecode=" + entityTypeCode + "&TemplateId=" + wordTemplateId + "&TemplateType=" + templateType;
                console.log(request);
                var req = new XMLHttpRequest();
                req.open("POST", path, true);
                req.responseType = "arraybuffer";
                req.setRequestHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8");
                req.setRequestHeader("Accept-Language", "en-US,en;q=0.8");
                req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
                req.onreadystatechange = function () {
                    if (this.readyState == 4) {
                        req.onreadystatechange = null;
                        if (this.status >= 200 && this.status <= 299) {
                            var mimetype = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
                            var blob = new Blob([req.response], { type: mimetype });
                            var downloadurl = URL.createObjectURL(blob);
                            var a = document.createElement("a");
                            document.body.appendChild(a);
                            if (navigator.msSaveOrOpenBlob) {
                                navigator.msSaveOrOpenBlob(blob, filename);
                                return;
                            } else {
                                a.href = downloadurl;
                                a.download = filename;
                                a.click();
                            }
                            Xrm.Utility.closeProgressIndicator();
                        }
                        else {
                            Console.Write("An Error occurred exporting the word document." + err.message);
                        }
                    }
                };
                req.send(request);
            }
        },
        function (error) {
            Console.Write(error.message);
        });
}