Our eC-AuditTool is build for Windows operating systems (XP and newer). At this time we do not have a Mac version available for the eC-AuditTool.
While we do not support Mac OS, we do have some customers using the eC-Audit tool with Parallels running a Windows operating system.
However, there are reported issues with opening and saving their files, so we recommend if you're going to use Parallels then make sure it's not using coherence mode, save your files into the windows specific drive only, and turn off time machine running backups while you're working on the eC-AuditTool. We've had more success with Mac users who have the Boot Camp method of using Windows on a Mac.