Which software are you talking about? And what's the exact old version do you want to go back to. Please give me more details so that I can send the download link to you.
Thank you for asking. We are sincerely sorry to inform you that Epubor software doesn't support Mac10.9. It supports mac version 10.10 and later version. Any more problem, please feel free to contact us via support@epubor.com.