I recently updated my WHMCS version from 5.2.8 to 5.2.12. Now I cannot download the attachments. When clicking on the attachments its been redirected to the index page. I downloaded the patch and uploded the dl.php file to the root folder of WHMCS. But when I click on the attachments it shows "No results found page" ( 500.shtml). Anyone facing this issue. Any tips to resolve is much appreciated.
There isn't a newer patch. That post was posted by Matt (CEO of WHMCS, not an unofficial source). I got it via a ticket, and compared it to the one posted from Matt. It is the same patch, and the one that everyone who is having the issue is using.