There was a major change of the Pega Academy site – including some down time, so things might have been unavailable temporarily. Please try again, after clearing your browser cache, and let me know if issue persists. Use the URL academy.pega.com and select MY DASHBOARD from the upper left corner to access your courses. If you experience further issues please search the course in the Learning Library and from there launch the course and then click on the lesson. Try it also in incognito mode.