What have you built so far using EPM automate and your windows scripting?
Have you logged an Oracle SR to get specific information you have not be able to get from EPM automate?
Yes, use epmautomate listfiles to get a list of the logs in the outbox. Then parse the list to find the highest numbered log and download via epmautomate downloadfile.
Alternatively, you can run the data load rule via REST API and it will return the process ID, log filename, status, etc.