So ive signed up for the dev edition org. Ive tried using my playgrounds. What am i missing? No matter what i do I keep getting the error "Challenge Not yet complete... here's what's wrong: 
The 'Trailhead_Data_Manager' app was not found. Please follow the requirements and ensure the wave enabled org is setup correctly." Where do i get this app? I assumed it came already installed when you signed up for the dev org. Can anyone please help, this is the last module i need to complete the trail. Thanks in advance.