Hi meemee,
What you can do is using a file read task.
Check the output of this file read task with a value of a user variable
If there is a mismatch run the next task which is an email task,
if it's ok, skip the next task and go to the next (last task) (done by conditions).
The last task is setting the user variable to the output of the file read task.
You have to setup the user variable once by entering the current date time stamp.
Use a trigger to run your job every minute.
This should solve your issue.
Regards,
Erik
Uses Visualcron since 2006.