Never download "pre-installed" APKs from third-party sites. These often contain malware and violate copyright. Only use files you legally own.
To make this work, you must have the game installed on a PC (e.g., via Download Required Apps : Install both Xash3D FWGS CS16Client (which supports Condition Zero files) from the Google Play Store Prepare Folders : On your Android device, create a main folder named in your internal storage. Transfer PC Files
There is no standalone APK. The only working method is the Winlator/ExaGear approach described above.
Full support for bots, just like the original PC version.
In the launch settings or command line within the app, ensure it is set to run the Condition Zero game by using the parameter -game czero Launch and Play "Launch CS16Client"