Hi Yumi, we are really sorry that you are unable to download the app on your Fire device. Plugo app is compatible with the Amazon Fire HD 8 2018 release (8th gen) and 2020 release (10th gen). We would kindly request you to write to us at reachout@playshifu.com, we will further assist you to download the app on your device. Sincerely, Team PlayShifu