Windows 10 product key is required to activate Windows 10. It will unlock Windows features and removes the watermark, that is always asking to activate Windows.
Windows 10 activation via Windows 10 product key is the easiest method for activation, as extensively described in Best Windows 10 Activator.
You have to buy a separate Windows Product Key from an authorized reseller of Microsoft Windows. As you know Windows 10 has different editions, so the price for each edition is different.
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