Hello Chris,
I have checked your site and this issue is nothing related to EasySocial but your plugin "Aikon Super Preloader" is resetting the headers on the page so that it always sends back a header of text/html . This causes the ajax script to fail. I have disabled this plugin and the installation works fine.
By the way, your license only entitles you for support for 1 site only. If you have another site, and it runs on a different domain, you will need to purchase a separate license for support