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You cannot get a “Pro key” from keygen sites or giveaways legitimately. Those are either fake, malware, or stolen. The developer (Goversoft) does not offer volume keys to the public.
Users typically search for keys because the free version, while powerful, can be somewhat manual in its operation. The Pro (Donors) version offers automated maintenance and deeper access to specific areas of the computer, making it highly desirable for power users who want a "set it and forget it" solution.