You will need to find the CS Extreme V7 data files (usually a .zip file) and the CS16Client APK.
Search for a verified download link on trusted gaming forums or YouTube modder channels. Download the APK file (the application installer). Cs Extreme V7 Android Download
Lack of official servers means multiplayer matchmaking requires manual local network setup or third-party room apps. Safety and Security Warning You will need to find the CS Extreme