cannot use the free trial

Hello, I have just registered for a free trial of coursepress and I have wordpress installed on my computer. So I boot it up from localhost. When I install the coursepress pro plugin, it says:

"This local development site url has previously been registered with WPMU DEV by the user Ari(a*i@nomo* To use this site url, login with the original user or upgrade your trial to a full membership. Alternatively, try a more uniquely named development site url. Contact support if you need further assistance."

I find it absurd that I cannot try the plugin through the localhost. Hope there is a fix for that.