The SOS download for the installer IS pre-activated and shows PRO in the windows title bar and in the About Us popup shows Activate and 6.2.2.520 (Giveaway Version) and installs in Vista just fine has 32bit and 64bit versions inside. It *might* even work in XP it might not as the DLL WDRLib.dll is designed for NT 6.0 so might not be loadable under XP NT 5.1/5.2
On first run it offered a rate me pop up on exit with various questions for experience and suggestions… my suggestion is to allow scanning of a dd disk image file rather than just physical drives. For when a drive is failing and one makes a fault tolerant image of the failing drive and work on that than the continually failing drive which is going to just get worse and worse and ultimately fail completely.