It is the OS X Installer that checks version compatibility. Since Alan downloaded Safari from Softonic it is entirely possible the installer was either bypassed completely (drag and drop install) or the installer was cobbled to bypass the version checks. As one of our more astute contributors said,
Originally Posted By: artie505
There you go... That's why you should never d/l Apple software from a source other than Apple, itself (via Software Update).

SU would not have offered you the Safari 6.0.2 d/l if it is not compatible with the version of OS X you're running.

And further, you never know precisely what you're getting when you use a 3rd party source.
grin

If we knew what it was we were doing, it wouldn't be called research, would it?

— Albert Einstein