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http://www.Microsoftkeystores.comI also faced the same problem as you several days ago. My computer operated extremely slowly and I decided to upgrade the operating system. I installed Windows 10 Pro Product Key but it required me to activate it with a product key. Then I searched the product key on site and compared them. Finally I got a powerful and genuine product from the site http://www.Microsoftkeystores.com . The product key was sent to me in a short time and I had Windows 10 Pro Product Key activated effectively and efficiently.
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I am afraid that you are unable to activate your Windows 10 Pro Product Key without a product key. You can just order one from the online site http://www.Microsoftkeystores.com cooperated with Microsoft. All the product keys are legitimate and official. Then just activate your Windows 10 Pro Product Key with the purchased product key. The activation process is simple and easy to operate.