I use the syntax below to download the file described in it, but it was opening in another page instead of downloading it. The syntax is as follow;
function passwd() {
  var password = prompt('Enter the pin to download the file: ');
  if (password.toLowerCase() == "1472") {
    window.open("folder/file")
  } else {
    alert("incorrect password!! please try again");
  }
}<input type="button" value="download" onClick="passwd()" /> 
     
    