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Evan DelgadoEvan Delgado 

I downloaded the DreamHouse package and it still says I haven't installed it yet

Rahul KumarRahul Kumar (Salesforce Developers) 
Hi Evan, please refer the below link for reference. hope it helps.

Please mark it as best answer if the information is informative.

Thanks
Rahul Kumar
NagendraNagendra (Salesforce Developers) 
Hi Evan,

Sorry for this issue you are encountering.

I had the same issue not being able to download the dreamhouse app. I resolved it by doing the following. This is for people who also have the 30 day trial along with the Trailhead playground.

1. I have a 30 day free trial with a username and a playground with a different username.
2. When you click the link to install dreamhouse (from the challenge box) it will take you to the window that displays the boxes to select all users.
3. LOOK at the address in the browser. It should be your playground username, NOT your 30-day trial username.      
4. Replace your 30-day trial username with your playground username. It will then download and you can pass the challenge.
5. Replace the address as in this example -------------https://insert your playground username here-dev-ed.lightning.force.com/.............

Please let us know if this works for you.

Thanks,
Nagendra