Quoting Parallels website about Parallels Compressor Workstation:
Optimized for desktop versions of Windows
Parallels Compressor is specifically designed to work with desktop versions of Windows, including Windows XP Professional and Home Editions SP2, Windows XP Professional x64 Edition SP1 and Windows 2000 Professional
Where did you find a Parallels Compressor product for Mac?
There is one version for Windows and one for Linux.
I see no Mac version.