Open ZArchiver , find your downloaded OBB zip, and extract it. Move the folder (usually named com.ea.gp.fifaworld ) to: Internal Storage > Android > obb .
When you install the APK from a third-party source, the app tries to ping EA’s servers. Since they are offline, it throws a server error. The comes by replacing the stock APK with a patched/modded version that bypasses the server handshake, combined with the correct Extra Quality OBB (ZIP) file. Fix Server Fifa 16 Zip File Extra Quality Download Android