How to Install the Lightning Experience DreamHouse app to Trailhead Playground
Select Your Trailhead Playground dropdown and Click Launch Button.
Add the packagingSetupUI/ipLanding.app?apvId=04tB00000009UeX URL after lightning.force.com/ Your Trailhead Playground URL.
For Example:
Your Trailhead Playground:
https://brave-badger-nta6oa-dev-ed.lightning.force.com/
To install DreamHouse app add url like:-
https://brave-badger-nta6oa-dev-ed.lightning.force.com/packagingSetupUI/ipLanding.app?apvId=04tB00000009UeX
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Use Case by Erin Bunting – DreamHouse App (https://success.salesforce.com/answers?id=9063A000000eOJO)