Supporter, premium member

Hi,
I have just become a premium member. I have buddypress latest installed and running. now I downloaded supporter. copied files to mu-plugin directory. when I go to my plugins it says Premium plugins are only available to Supporters. Why not become a Supporter today?

then I click on it and get error

Fatal error: Call to undefined function get_blogaddress_by_id() in /home6/tangosfe/public_html/wp-content/mu-plugins/supporter-gateway-paypal.php on line 170

My questions;
- Do I still need to be supporter after becoming premium member ?
- how can I get ridof this issue?

I am running my own domain not (Tangosfer.net)

Regards,
Aydogan