Many websites promising a "free activation key" or "crack" for version 51102 often bundle their downloads with hidden risks:
Downloading software from unofficial sources or using "cracked" keys can lead to serious issues: Malware & Viruses:
Here is some references to typing tutors that are well-regarded:
Which of those would you like? If you want a comparison or alternative recommendations, tell me whether you prefer free/open-source, Windows-only, or web-based tutors.