Are you trying to do a full image restore or are you trying to restore a few files?
If you are trying to restore your complete computer image, I don't know what options you have. It looks like the last supported operating system for running Simply Safe Backup was Windows XP.
If you only need to restore a few files, you could create a Windows XP virtual machine and install Simply Safe Backup. Come to think of it, if it was really imperative that you restored the complete image you could do that with a Windows XP virtual machine too.
As for finding a copy of Simply Safe Backup, it looks like you might be able to download the installer from the Way Back Machine.
I'm sorry I'm not particularly familiar with that program, so my suggestion may be seriously more involved than it could be.