No specific info about version 5.0. Please visit the main page of Setup Factory on Software Informer.
This is the first anti-virus I have bought after having the free version for a long while.
It works like a charm and doesn't take much memory.
Its the latest version while I need its old freeware version.
As I know, there is no possibility to download the earliest versions of Setup Factory from its official website.
Try searching Google for them.