Hi,

I am attempting to complete the above hands on challenge in the Lightning Experience Reports & Dashboards - Extend Your Reporting Strategy with App Exchange trail. 
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However when I go to the app exchange and select the Salesforce Adoption Dashboards package and the Get It Now - a pop-up screen comes up asking me to Open Login Screen which I select.

A second pop-up screen then appears asking to Allow Access for my trail head playground user name which I Allow.

Then the pop-up screen loads and changes to a view of the trailhead playground interface with the following:

URL No Longer Exists
You have attempted to reach a URL that no longer exists on salesforce.com. 

You may have reached this page after clicking on a direct link into the application. This direct link might be: 
• A bookmark to a particular page, such as a report or view 
• A link to a particular page in the Custom Links section of your Home Tab, or a Custom Link 
• A link to a particular page in your email templates 

If you reached this page through a bookmark, you are probably trying to access something that has moved. Please update your bookmark. 

If you reached this page through any of the other direct links listed above, please notify your administrator to update the link. 

If you reached this page through a link on our site, please report the broken link directly to our Support Team and we will fix it promptly. Please indicate the page you were on when you clicked the link as well as any other related information. We apologize for the inconvenience. 

Thank you again for your patience and assistance. And thanks for using salesforce.com!

Anbody know why this is happening or why I cannot download the package?

Many thanks,

Alex