Before Auto Task Scheduler run tasks, your Mac must keep awake. You could run an action of Auto Task Scheduler to do this, but we recommand you set the "System Preferences" - "Energy Saver" of Mac OS for this. Click me to know how.
You could let Auto Task Scheduler "Run at Mac OS startup" to avoid missing your scheduled tasks. Click me to know how.
If you purchased the software on Mac App Store, click me to know how to upgrade and get all features by FREE.
Menu of Auto Scheduled Tasks