To set up a log file for a script select the tab marked 'Logging' on the Macro Properties Window.

To enable logging check 'Log Progress of Macro'.

You can have Macro Scheduler purge the log file before each run by ticking the second box.

Enter a file name for the log file or select an existing one by using the browse button. If you like you can use one file for more than one macro.

In Log Level you can specify whether to log just after each script step is executed, just before, or before and after.