Solution 1 Shut Down and Restart Your Kindle Device :
This fixes most problems.
Solution 2 Disconnect and Reconnect back Your Wireless Connection : Once you have disconnected and reconnected back your Wireless Connection to your Kindle, now all you have to do is just check if your wireless connection does indeed work.
Solution 3. Delete and Redownload Your App or Book : If you find that your app or your book that you’ve just downloaded gets stuck downloading halfway through then here’s what you do:
Step 1: Select your app and Delete it from your Kindle app or your device.
Step 2: Done? Alright. Now try downloading it back from the cloud section.
Solution 4. Manage Your Content and Devices setting
Step 1: Head to Manage Your Content and Devices page over at Amazon.
Step 2: Now find the book or app that you find it won’t download and then select Actions.
Step 3: Next choose to Deliver that to a specific device of yours. You can also choose to download and transfer it to your device from your computer using a USB cable.
Solution 5. Check Your Digital Orders :
If the book or the app that you were trying to download doesn’t appear in Your Content and Devices, then here’s what you do:
Step 1: Check and make sure that the book or the app that you were trying to download was indeed completed by heading over to Amazon.
Step 2: Once you’re in Amazon, check Your Orders and then Digital Orders.