Zidoo updated their Kodi fork to version 18.9
APK
Zidoo APK Version Overview
overview has been redesigned to support sticky first column and row highlight for better user experience
Zidoo Home Theater v4.0.21 – McBluna.net
With the Z1000 Pro beta firmware v6.0.45_G Zidoo updated Home Theater to version v4.0.21
I’ve created a modded APK for the Android 6/7.1 devices based on the Android 9 code from the Z1000 Pro beta firmware v6.0.45_G
Zidoo Home Theater v4.0.20 – McBluna.net
With the 
I’ve created a modded APK for the Android 6/7.1 devices based on the Android 9 code from the
Zidoo Music Player v6.7.6
With the Z9X/Z10 Pro Beta Firmware v6.0.45 Zidoo updated Music Player to Version v6.7.6
I’ve created a modded APK for the Android 6/7.1 devices based on the Android 9 code from the Z9X firmware v6.0.45_G beta
Modded APKs for Android 6/7.1 devices based on Android 9 firmware
It took me three days to figure out how to create working APKs for the Android 6/7.1 devices based on the Android 9 code from the Z9X firmware v6.0.35.
Update 2020-09-10: Since Zidoo released an update for Z9S with even more current versions of their apps, the use of modded APKs is not necessary for now.