Usar o APKPure APP
Obter o APK da versão antiga de Quick Task Killer para Android
Quick Task Killer is the simple task killer.
When you start the app, kill task and frees the memory.
You can select applications that you do not want to kill.
Please replace "SmartTaskKiller"
https://play.google.com/store/apps/details?id=jp.smapho.smarttaskkiller