There is very little difference in protection as Alwil haven't crippled the Home, free version and essentially the difference is no script blocker in the Home version. The major difference is the interactive input requirements, no automated action on detection, less configurability, no Enhanced User Interface, no scheduling of on-demand scans.
These automated options are only available in the Pro version. This is a limitation of the Home (free) version that it has interactive input requirement, there have to be differences in the Home/Pro version and this is one of them, the programmers have to eat
So why not try the Pro Trial version, it gives 60 days unrestricted use, if you like it and its configurability and convenience then you can purchase your license or you can register for the Home version and get your registration key. You enter that whilst you are connected to the internet and the version will automatically be downgraded to the Home version.