You can create download link in many ways one of the way is as below:
Create a file download.php like below
<?php
// The file path where the file exists
$filepath = "http://mohitsharma.net/downloads/".$_GET['filename']."";
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
//setting content type of page
header("Content-Type: application/force-download");
header("Content-Disposition: attachment; filename=".basename($filepath ));
header("Content-Description: File Transfer");
//Read File it will start downloading
@readfile($filepath);
?>
Use following link to download
<a href="http://mohitsharma.net/download.php?filename=test.doc">Download</a>