Some newer apps (like newer versions of Chrome, Facebook, or banking apps) will never work on Android 4.4.2, no matter how much you update the Play Store. Consider this a final "life support" update, not a complete fix.
Because many modern apps no longer support KitKat even if the store is working, consider using alternative app stores that host older, compatible versions of apps: Aptoide: Often has older versions of popular apps. download google play store android 44 2 better
How to Download and Update Google Play Store on Android 4.4.2 Some newer apps (like newer versions of Chrome,