Unable to configure Coursepress Pro

I had the free version of Coursepress and then upgraded to the paid version(Coursepress Pro). After installing the plugin when I click on configure, I get this error
---403 Forbidden
Permission denied. Our sentries tell us that you should not be here.
Website owner? If you think you have reached this message in error, please contact support.
My WP plugins dashboard prompts me to back-up and upgrade from Coursepress1 to Coursepress2, but when I try to do it I repetedly get a Unsuccessful upgrade message