If your device never had Google apps (e.g., a Chinese tablet or a custom ROM without GApps), you must install a minimal GApps package for KitKat.
Navigate to APKMirror and search for "Google Play Services 21.30.99". You will see a list of variants. Look for the following in the filename: google play service android 442 install
While technically possible to sideload an archived Google Play Services APK onto Android 4.4.2 (provided you find the correct 20.9.xx variant and have root access), the outcome is a . Core Google features will degrade, third-party apps relying on modern Play Services APIs will crash, and the device will become a security liability. For any serious purpose, upgrading to a custom ROM based on Android 5.1 (API 22) or higher is the only reliable path to functional Google Play Services. For 4.4.2, the curtain has effectively fallen. If your device never had Google apps (e