The Demand 5 app is compatible with the Kindle Fire HDX 7-inch and 8.9-inch.
To install the app:
- Tap Shop in the navigation bar
- Tap Apps in the menu on the left
- Search for Demand 5, then tap the first result
- Tap the Free button to install
Please note: the Demand 5 app isn't compatible with any other Kindle Fire tablets, such as the previous generation Kindle Fire HD.