Because the built-in Play Store likely cannot update itself anymore, you must use the "Sideloading" method.
Do not download the absolute "latest" version of the Play Store, as modern versions require Android 5.0 or higher. You need versions labeled for (Android 4.4+). Google Play Store (Final Stable): Look for version or similar variants ending in (the code for KitKat). Google Play Services (Final Stable): Look for version 2. Where to Download Use reputable repositories to avoid malware: google play store apk android 44 2 download top
If you absolutely need to keep a KitKat device running for basic tasks (e.g., a dedicated music player, e-reader, or old game console), manually downloading the correct Play Store APK is worth the effort. However, manage expectations—you won’t get modern apps like the latest TikTok or banking apps. Because the built-in Play Store likely cannot update