Amazon Fire HD8 (Kids) Tablet Error Opening "Downloaded" Section
Oops Something Went Wrong. Please try again Later when trying to access Kids Fire HD 8 tablet "Downloaded" section
In short, the solution is to update the devices operating system.
Connect the Fire HD8 tablet to Wi-Fi. Navigate to the Adult Profile's settings > Device Options > System Updates > Updates > Check Now. Keep tapping Check Now until it says "No updates found" beneath Updates.