Hi there,
You will likely need to delete the plugin via FTP.
I highly recommend you update your PHP asap, 5.3 is very outdated and no longer supported.
Best regards
I have the same issue but I have an updated version of PHP which is 7.2. I can’t uninstall the plugin
I really do not understand why this very good plugin has so bad support. I really want to buy the pro version, I sent emails to the developer, but no answer, as long as I can not use anymore the free version. In fact, I had a previous Support page made by myself, but this plugin creates automatically a support page. I uninstalled the plugin in the first instance, but also I deleted Support, Login, Create Ticket and Edit Profile pages. Even I removed the plugin using FTP, when I reinstall it, the pages I told earlier are not created anymore. If I create them manually and assign them from settings, the plugin does not work properly, it brokes the format pages and other issues. I please plugin author to answer how to solve these problems. Thanks.