Ok, I went to disable the plugin so I could re-install, but the website returned the following error:
Fatal error: Call to undefined function wpdm_is_ajax() in /home/content/p3pnexwpnas14_data01/62/3060962/html/wp-content/plugins/wpdm-premium-packages/includes/libs/cart.php on line 53.
Looks like the error is with the Premium Packages add-on – any ideas as to what is going wrong?