This extension not works on servers which dont have cURL installed. Unfortunately there are many hosting's who do not support cURL and openly announce that they will not support it in future also because 'it expose his hosting's to unwanted operations' I give 1 star rate because in my case its useless as long as it require cURL to work, while authors of this extension also not show will to do anything about it.
Jfusion does very complex work and requires some basic functions (including cURL for some software integrations). Asking us to do very complex integrations without some basic software functions is like asking a brain surgeon to operate with only a fork.
If you need complex integrations for your website you better get dump our bad host. Really there is no valid excuse for a host not to support cURL.