I have found the reason why it is not working with any beta or release candidates of version 2. It’s because the plugin is only detecting woocommerce like so: if(in_array('woocommerce/woocommerce.php', apply_filters('active_plugins', get_option('active_plugins')))){
which is correct, but for it to work on lets say RC2, it needs to read like this: if(in_array('woocommerce-2.0.0-RC2/woocommerce.php', apply_filters('active_plugins', get_option('active_plugins')))){
.
So either change the directory folder for the woocommerce plugin or edit the plugin to detect the version you are using.
WooCommerce RC 2
if(in_array('woocommerce-2.0.0-RC2/woocommerce.php', apply_filters('active_plugins', get_option('active_plugins')))){