Installing Windows 10 on a new motherboard/cpu/old hdd

I'm planning on getting a cpu and motherboard for myself for Christmas while retaining all the other parts in my current build, in doing so I want to do a fresh install and format of the HDD. So my question is when I'm installing windows 10 ( planning on using the media creation tool on Microsoft's website ) will I need a Product Key or will I be able to skip entering it? And if I would need a key is there anyway around it besides buying another copy of Windows 10?
Thanks in advance
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  1. Best answer

    The answer is Yes you can skip the activation step where in you'll be asked with a product key.

    Here's the complete guide on how to do a clean install of Windows 10:
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