Because modern versions of the Play Store require Android 7.0 or higher, you must download a specific "legacy" variant.
Go to Settings > Security and toggle on Unknown Sources . This allows you to install apps from outside the official store. Google Play Store Apk For Android 4.4 2
Google dropped support because active KitKat devices now account for less than 1% of the global user base . Maintaining security for such an old platform prevents Google from implementing modern encryption and performance improvements in newer systems. Because modern versions of the Play Store require Android 7