The developer, Antonio Da Cruz, has a long history of providing graphic tools to the Windows community. The transition to a freeware model for Photofiltre 11 was likely a strategic move to simplify the distribution of his life's work and build a legacy user base without the overhead of payment processing and licensing servers.
While PhotoFiltre 11 can be downloaded and installed for free, the software is only fully functional with a valid registration key. Without a registration key, users are limited to the trial version of the software, which may not offer all the features and tools available in the full version. Photofiltre 11 Registration Key