CoursePress stopped working

A message says "It looks like you had CoursePress 1 installed. In order to upgrade your course data to CoursePress 2, we strongly recommend you to backup your website before upgrading here. Once the upgrade is complete you will be able to use CoursePress again."

We are already using version When clicking to install, the message just comes up again. Our class has disappeared from the WP Dashboard and the frontend portion related to training isn't working.

Can you take a look:
EDIT by Predrag: Removed login details