Can’t update to Kodi 17.1

My AMlogic S905 based Android (ver 6.0.1) box (XGODY) doesn’t seem to want to let me sideload Kodi 17.1 from Kodi 16.1 Jarvis.

I am using the appinstaller app to install the apk from USB thumb drive. The apk file I’m using is: kodi-17.1-Krypton_rc1-arm64-v8a

Appinstaller looks like it doing something but ultimately ends with app not installed message being displayed.

Do I need to completely uninstall Kody 16.1 from my box? If I go to the Google Play Store and try to install 17 from there Playstore acts like it’s already installed on my box. It only gives me the option to open Kodi not to upgrade it.

I’m definitely not an expert with Kodi, Android or the TV box. Any help would be much appreciated. Please instruct me as if I were a six year old.