Provide download through IDM without revealing the file's url using PHP

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PHP

Apache

web_development

Hello Friends,
I am developing a website in PHP. I am stuck at a point and now I am here to ask for help. I am trying to secure the url where my files are stored and don't want my users to get the link of the same. I tried with something like this which actually is working fine.

<?php
 session_start();
 if(!isset($_SESSION['ID']) && isset($_SESSION['ID_old']))
 {
// This is just a simple test for user coming here from the correct path
// and not directly
  session_id($_SESSION['ID_old']);
  $_SESSION['ID'] = session_id();
  unset($_SESSION['ID_old']);
// This is the main code that I want to show you guys
  $file = urldecode($_GET['file']);
  header("Content-disposition: attachment; filename=".$file);
  header("Content-type: ".mime_content_type("filestore/".$file));
  header("Content-length: ".filesize("filestore/".$file));
  header("Content-Transfer-Encoding: binary");
  
  readfile("filestore/".$file);
 }

This is the function that provides the download of the file without revealing the address of the file atleast to normal user (can't say for advanced users i.e. hackers).
Yet the problem is that this method seems not to be working with IDM and it refuses the download link...
Error : Some sites do not allow downloading of files twice.

Kindly help me with the problem.... Thank you very much.

With Regards
Tushar Srivastava