Hi Thimo,
I have the same issue. My console output is:
load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=4.3:5 POST http://rugby-tshirts.co.uk/wp-admin/admin-ajax.php 500 (Internal Server Error)
Bluehost says that cURL is enabled by default on their servers. Do you know what else could resolve this?
I look forward to using the plugin :)
Thanks
Noel