As precondition you should read my guide “How to uninstall a system application“. It will show you how to root your device and how to use the Android Terminal Emulator.
Don’t install the modded APK directly eg. with ApkInstaller or you will end up with missing permissions!
execute Terminal Emulator
change from role user to superuser
su
change to Download directory
cd /sdcard/Download
list directory content
ls -l
use the package manager to install Home Theater
pm install -g zidoo_poster_4.0.8-McBluna-signed.apk
Can you put together a guide for installing on Android 9?
The player must be rooted. As far as I know, root is not available for the Android 9 players.