Hi Humayon,
I apologise, I didn’t have any notification about a new version of the add-ons in my website management software; I had never realised before that you can only upload the add-ons through the plugin setting, after logging in. I have now updated the add-ons and they seem to work fine, however when I try to upload ‘Download Manager Free’ and ‘WordPress Download Manager v3.0’ in the setting panel, the update orange button says ‘Success’bu I also receive an email from WordPress saying that a fatal error has occurred on the php file of the website (https://staging-cairnshockey.wordifysites.com/wp-admin/admin-ajax.php), and if I refresh the setting page the orange button goes back to ‘Update’.