Thanks a lot!
Also I found the similar situation during converting from win10 to win7.
If task contains custom trigger it cannot be converted to low version win7 and throw unhandled exception if you try to change configuration from win 10 to win 7.
Existing task to test "Device Install Reboot Required"
Image may be NSFW.
Clik here to view.
Exception:
Also I found the similar situation during converting from win10 to win7.
If task contains custom trigger it cannot be converted to low version win7 and throw unhandled exception if you try to change configuration from win 10 to win 7.
Existing task to test "Device Install Reboot Required"
Image may be NSFW.
Clik here to view.

Exception:
xception: System.ArgumentException
Message: Value does not fall within the expected range.
Stack Trace:
at Microsoft.Win32.TaskScheduler.V2Interop.ITaskDefinition.get_XmlText()
at Microsoft.Win32.TaskScheduler.Trigger.CreateTrigger(ITrigger iTrigger, ITaskDefinition iDef) in C:\spb.Common Components\TaskScheduler\TaskService\Trigger.cs:line 625
at Microsoft.Win32.TaskScheduler.TriggerCollection.<GetEnumerator>b__38_0(Object o) in C:\spb.Common Components\TaskScheduler\TaskService\TriggerCollection.cs:line 298
at System.Runtime.InteropServices.ComEnumerator`2.get_Current() in C:\spb.Common Components\TaskScheduler\TaskService\Native\InteropUtil.cs:line 120
at Microsoft.Win32.TaskScheduler.TriggerCollection.Find(Predicate`1 match) in C:\spb.Common Components\TaskScheduler\TaskService\TriggerCollection.cs:line 258
at Microsoft.Win32.TaskScheduler.TriggerCollection.ContainsType(Type triggerType) in C:\spb.Common Components\TaskScheduler\TaskService\TriggerCollection.cs:line 201
at Microsoft.Win32.TaskScheduler.TaskDefinition.GetLowestSupportedVersion(IList`1 outputList) in C:\spb.Common Components\TaskScheduler\TaskService\Task.cs:line 2084
at Microsoft.Win32.TaskScheduler.TaskDefinition.Validate(Boolean throwException) in C:\spb.Common Components\TaskScheduler\TaskService\Task.cs:line 1968
at Microsoft.Win32.TaskScheduler.TaskPropertiesControl.taskVersionCombo_SelectedIndexChanged(Object sender, EventArgs e) in C:\spb.Common Components\TaskScheduler\TaskService\TaskEditor\TaskPropertiesControl.cs:line 1071
at System.Windows.Forms.ComboBox.OnSelectedIndexChanged(EventArgs e)
at System.Windows.Forms.ComboBox.WmReflectCommand(Message& m)
at System.Windows.Forms.ComboBox.WndProc(Message& m)
at System.Windows.Forms.DisabledItemComboBox.WndProc(Message& m) in C:\spb.Common Components\TaskScheduler\TaskService\TaskEditor\Native\DisabledItemComboBox.cs:line 492
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)