Cannot access points for completed challenge

For the "Install AppExchange Packages" unit (https://trailhead.salesforce.com/fr/content/learn/modules/appexchange_basics/appexchange_basics_install), I installed the package before clicking "Launch." 

The unit states, "If you followed along with the steps in this unit and already installed the Salesforce Adoption Dashboards package in your playground, simply click Check Challenge below." 

I see no "Check Challenge" button to click. I am at a stalemate. I completed the challenge and cannot access the 500 points.