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If you've obtained a legitimate product key, follow these steps to activate Windows 10 Pro:
While the idea of getting a free Windows 10 Pro key is tempting, the reality is grim. Here is what is likely hiding behind that shortened link.
To activate Windows 10 Pro, you need a product key. A product key is a 25-character code that unlocks the full features of Windows 10 Pro. Without a product key, you'll be stuck with a limited version of Windows 10, known as Windows 10 Home.