and a quick look at the Stellar Backup web site shows the reason why Stellar backup does not run on your Mac. (note the Capitalization)
Stellar Backup is a Windows program and requires XP or Vista to run.
I bought the TurboCAD 2D/3D Delux for MAC. It does install but want run. Message says something about licence manager - when hit OK it terminates. Trying to get answers from IMSI but no replays.
So far any software that I bought for iMac did not worked like Stellar backup, now turbo CAD. Looks like any software that is available outside Apple shops is just scam