Unfortunately the issue is unrelated to the plugin, as it cannot possibly create that output, it is tempered with it seems like. This is probably a server related issue then.
All I can suggest is:
– Try completely wiping the plugin installation and re-install fully from the installer from codecanyon.net. To make sure that there was no error during moving the files.
– Checking your server configuration
– Checking the CDN configuration
– Contacting the server provider to ask about the unwanted output within the ajax response.
I can check the configuration then, if you want to. Please make sure that the support account has the admin privileges, as currently I cannot access the plugin dashboard.