To ensure maximum stability on KitKat (API 19), you should target these specific final builds:
It is often essential to restart your device after the installation finishes to ensure the system recognizes the new version. Google Help 4. Essential Companion Updates
: Designed during the "Project Svelte" era, this version is lightweight and can run on devices with as little as 512MB of RAM.
Once downloaded, swipe down your notification shade and tap the downloaded file. If the installer asks whether you want to "Update" the existing Play Store, tap (You cannot uninstall the Play Store; you only update it.)