Recommend you update to this beta test version, 3.0.8.11, which have fixed the problem that can't open.
http://download.epubor.com/epubor_ultimate_30811.zip
If still failed to open, please adjusting your privacy settings.
On your Mac click "System Prefences" -- "Security & Privacy", then choose "Anywhere" below the "Allow apps downloaded from".
Ran epubor ultimate on Win 7 Pro PC and I cannot open the app because of an exception error!
Please advise.
