Use APKPure App
Get Panzer War Mod Installer old version APK for Android
Een mod-installatietool
The installation of mod has been simplified by this tool. And it is made by Panzer War official,ShanghaiWindy.
You can select *.modpack file from this tool and it will automatically add it to the game mod folder.
Check out the game Panzer War from here:
https://play.google.com/store/apps/details?id=com.shanghaiwindy.PanzerWarOpenSource
And,this mod tool is open source. https://github.com/Doreamonsky/PanzerWar-ModInstaller