diff --git a/lib/download.php b/lib/download.php
index 4c9e67e..11a329b 100644
--- a/lib/download.php
+++ b/lib/download.php
@@ -10,8 +10,14 @@ if (!file_exists($file) || strpos(str_replace("\\","/",$file),$docRoot) !== 0) {
 }
 
 if (file_exists($file)) {
+    header("Pragma: public");
+    header("Expires: 0");
+    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
+    header("Cache-Control: public");
     header('Content-Description: File Transfer');
+    header("Content-Type: application/octet-stream");
     header('Content-Disposition: attachment; filename='.basename($file));
+    // header("Content-Transfer-Encoding: binary");
     header('Content-Length: '.filesize($file));
     ob_clean();
     flush();