No, there is no version of Aviation Checklist Editor compatible with the operating system running on the iMac. I've found on the official website the following system requirements: IBM-compatible PC running Windows XP Service Pack 2 or later operating system.
As you can see, there is nothing mentioned about the OSX system. However, you could try WineBottler to attempt a possible launch of a Windows app in Mac OSX. Install and run WineBottler, then follow its instructions.
